1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
UkoKoshka [18]
3 years ago
13

Which set of numbers can represent the side lengths, in inches, of an acute triangle? 4, 5, 7 5, 7, 8 6, 7, 10 7, 9, 12

Mathematics
2 answers:
Gennadij [26K]3 years ago
4 0

Answer:

Set B i.e., 5 , 7 , 8 represent the side of acute angled triangle.

Step-by-step explanation:

Given: Set of numbers.

To find: Set that represent sides of an acute angled traingle.

We use the following result:

When given 3 triangle sides then to determine if the triangle is acute angled , right angled or obtuse angled.

First find Square all 3 sides, then Sum the squares of the 2 shortest sides and then Compare the sum to the square of the last side.

if sum > Square of last side ⇒ it is Acute Triangle

if sum = Square of last side ⇒ it is Right Triangle

if sum < Square of last side ⇒ it is Obtuse Triangle  

a). 4  , 5 , 7

4² = 16 ,  5² = 25 , 7² = 49

16 + 25 = 41

∵ 41 < 49

⇒ It is an Obtuse Traingle.

b). 5 , 7 , 8

5² = 25 , 7² = 49 , 8² = 64

25 + 49 = 74

∵ 74 > 64

⇒ It is an acute Triangle.

c). 6 , 7 , 10

6² = 36 , 7² = 49 , 10² = 100

36 + 49 = 85

∵ 85 < 100

⇒ It is an Obtuse Triangle.

d). 7 , 9 , 12

7² = 49 , 9² = 81 , 12² = 144

49 + 81 = 130

∵ 130 < 144

⇒ It is an Obtuse Triangle.

Therefore, Set B i.e., 5 , 7 , 8 represent the side of acute angled triangle.

dimaraw [331]3 years ago
4 0

The set of number which represent the length of the sides of an acute triangle is 5,7,8 i.e., \fbox{\begin\\\ \bf option 2\\\end{minispace}}.

Further explanation:

A triangle is two dimensional figure which is formed when three non-collinear points are joined. It has three sides, three angles and three edges.

Consider a triangle with sides as L_{1},L_{2} \text{and} L_{3} such that L_{3}>L_{2}>L_{1}.

The categorization of a triangle on the basis of side is as follows:

1) Acute triangle:  If the square of the longest side is smaller than the sum of the square of the other two sides than the triangle is an acute triangle.

This implies that if, (L_{3})^{2} then the triangle is an acute triangle.

2) Obtuse triangle: If the square of the longest side is greater than the sum of the square of the other two sides than the triangle is an obtuse triangle.

This implies that if, (L_{3})^{2}>(L_{1})^{2}+(L_{2})^{2} then the triangle is an obtuse triangle.

3) Right triangle:

If the square of the longest side is equal to the sum of the square of the other two sides than the triangle is a right triangle.

This implies that if, (L_{3})^{2}=(L_{1})^{2}+(L_{2})^{2} then the triangle is a right triangle.

Option1:

In option 1 it is given that the length of the sides of the triangle are L_{1}=4, L_{2}=5 and L_{3}=7.

The length of the longest side is 7 units.

The square of the length of the longest side is calculated as follows:

(L_{3})^{2}=49

Calculate the value of (L_{1})^{2}+(L_{2})^{2} as follows:

\begin{aligned}(L_{1})^{2}+(L_{2})^{2}&=16+25\\&=41\end{aligned}

This implies that for option 1 the square of the length of the longest side is greater than the sum of the squares of the other two sides. So, the triangle with sides L_{1}=4, L_{2}=5 and L_{3}=7 is an obtuse triangle.

Therefore, the option 1 is incorrect.

Option2:

In option 2 it is given that the length of the sides of the triangle are L_{1}=5, L_{2}=7 and L_{3}=8.

The length of the longest side is 8 units.

The square of the length of the longest side is calculated as follows:

(L_{3})^{2}=64

Calculate the value of (L_{1})^{2}+(L_{2})^{2} as follows

\begin{aligned}(L_{1})^{2}+(L_{2})^{2}&=25+49\\&=74\end{aligned}

This implies that for option 2 the square of the length of the longest side is smaller than the sum of the squares of the other two sides. So, the triangle with the side L_{1}=5, L_{2}=7 and L_{3}=8 is an acute triangle.

Therefore, the option 2 is correct.

Option3:

In option 3 it is given that the length of the sides of the triangle are L_{1}=6, L_{2}=7 and L_{3}=10.

The length of the longest side is 10 units.

The square of the length of the longest side is calculated as follows:

(L_{3})^{2}=100

Calculate the value of (L_{1})^{2}+(L_{2}){2} as follows:

\begin{aligned}(L_{1})^{2}+(L_{2})^{2}&=36+49\\&=85\end{aligned}

This implies that for option 3 the square of the length of the largest side is greater than the sum of the squares of the other two sides. So, the triangle with the side L_{1}=6, L_{2}=7 and L_{3}=10 is an obtuse triangle.

Therefore, the option 3 is incorrect.

Option4:

In option 4 it is given that the length of the sides of the triangle are L_{1}=7, L_{2}=9 and L_{3}=12.

The length of the longest side is 12 units.

The square of the length of the longest side is calculated as follows:

(L_{3})^{2}=144

Calculate the value of (L_{1})^{2}+(L_{2})^{2} as follows:

\begin{aligned}(L_{1})^{2}+(L_{2})^{2}&=49+81\\&=130\end{aligned}

This implies that for option 4 the square of the length of the largest side is greater than the sum of the squares of the other two sides. So, the triangle with the side L_{1}=7, L_{2}=9 and L_{3}=12 is an

obtuse triangle.

Therefore, the option 4 is incorrect.

Thus, the set of number which represent the length of the sides of an acute triangle is 5,7,8 i.e., \fbox{\begin\\\ \bf option 2\\\end{minispace}}.

Learn more:  

1. A problem to complete the square of quadratic function brainly.com/question/12992613  

2. A problem to determine the slope intercept form of a line brainly.com/question/1473992

3. Inverse function brainly.com/question/1632445  

Answer details  

Grade: High school  

Subject: Mathematics  

Chapter: Triangles

Keywords: Geometry, triangles, acute triangle, obtuse triangles, right triangle, longest side, sum of longest side, classification of triangle, non-collinear points, 90 degrees, 5,7,8.

You might be interested in
10 Points!!! Write the equation of a line with slope 2 and y-intercept -1.
Alchen [17]

Answer:

y=2x-1

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
Can someone check this one for me , thank you!
Rudik [331]

Answer:

C

Step-by-step explanation:

Using sum/difference to product identity

• sin x - sin y = 2 cos(\frac{x+y}{2}) sin (\frac{x-y}{2})

with x = 4Θ and y = 2Θ

Then

sin(4Θ) - sin(2Θ)

= 2 cos(\frac{4o+2o}{2}) sin(\frac{4o-2o}{2})

= 2cos(3Θ)sinΘ → C

8 0
2 years ago
What is The Product of 4 and z is the same as 16 as an equation
Kaylis [27]

Answer:

4(z) = 16

Step-by-step explanation:

Product = the result of multiplication.

The same as = the equal sign.

7 0
2 years ago
Read 2 more answers
Which algebraic expression represents "the difference of 54 and a number"?
atroni [7]

\huge{\boxed{54-x}}

The difference is the result of a subtraction problem.

We are given two values that are being subtracted: 54 and a number, represented by x

So, represent this mathematically with \boxed{54-x}.

5 0
3 years ago
Read 2 more answers
Osvoldo has a goal of getting at least 30% of his grams of carbohydrates each day from whole grains. Today he ate 220 grams of c
LekaFEV [45]
Envenenan i don’t know
3 0
3 years ago
Read 2 more answers
Other questions:
  • Walgreens is offered a chain discount on cosmetics from Libby Corp. of 8/5/2; Roma Company offers a chain discount of 7/6/4. Wha
    13·1 answer
  • A grocery store has 367 cans of vegetables on each of 4 shelves. Which expression can be used to find how many cans of vegetable
    11·2 answers
  • Work out the length of the perimeter.
    11·1 answer
  • The difference of two numbers is 44 1/2 . If the smaller of the two numbers increases 7 times then the difference will be 10 3/1
    7·1 answer
  • To break even in a manufacturing​ business, income or revenue R must equal the cost of production C. The revenue R from selling
    11·1 answer
  • PLEASE HELP ASAP! WILL UPVOTE!
    14·1 answer
  • This is a visual display of some to the descriptive statistics of a data set. It quickly displays the 5-number summary: the mini
    5·1 answer
  • Need help! 20 points!<br> No links please
    7·1 answer
  • Now answer the question:
    6·1 answer
  • (q006) suppose you are a participant in an online forum where people review online games, and one participant recently posted an
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!