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
erik [133]
2 years ago
15

Given: △ABC, m∠A=60°, m∠C=45°, AB=9 Find: Perimeter of △ABC, Area of △ABC

Mathematics
1 answer:
stellarik [79]2 years ago
6 0

Answer:

Perimeter of ΔABC: \frac{27}{2} + \frac{9}{2} * \sqrt6 units

Area of ΔABC: \frac{81}{8}*\sqrt3 + \frac{243}{8} units

<u>Skills required: HS Geo, Special Triangles</u>

Step-by-step explanation:

1) The best option is to break down this triangle. Let's draw an altitude from Point B down to Segment AC. The point from the altitude that intersects AC is Point D. BD is the height of our triangle, AC is the base.

2) Angle A is 60 degrees, and since Angle BDA is 90 degrees, Angle ABD is 30 degrees. We can use the 30-60-90 degree right triangle property for the triangle BDA.

  • This states that if the side opposite the 30 degree angle is x, the side opposite the 60 degree angle is x*\sqrt3, and the side opposite the 90 degree angle is 2x.

AB is 9 units, and it is opposite the 90 degree angle. This means that 2x=9, x = \frac{9}{2} ==> This then means that AD, the segment opposite the 30 degree angle in this triangle is \frac{9}{2} units. Segment BD (the height) is \frac{9}{2} * \sqrt3.

3) Angle C is 45 degrees, and Angle BDC is 90 degrees, which means that Angle CBD is 45 degrees. We can use the 45-45-90 degree right triangle property for the triangle BCD.

  • This states that if the side opposite the 45 degree angle is x, the other side opposite a 45 degree angle is also x, but the hypotenuse (side opposite the right (90 degree) angle) is \sqrt{2}*x.

BD is \frac{9}{2} * \sqrt3, which means DC is the same. BC, which is the hypotenuse is BD multiplied by square-root-2, which is \frac{9}{2} * \sqrt6.

4) Area is \frac{1}{2}*b*h, the base (b) is AC (which is \frac{9}{2}+\frac{9}{2}*\sqrt3), the height is BD (\frac{9}{2}*\sqrt3). When multiple you will get \frac{81}{4}*\sqrt3 + \frac{243}{4}, then this multiplied by 1/2 is

\frac{81}{8}*\sqrt3 + \frac{243}{8} <--> this is the area!

5) Perimeter is just the sum of all side: 9 + \frac{9}{2} + \frac{9}{2} * \sqrt6 = \frac{27}{2} + \frac{9}{2} * \sqrt6 unit

You might be interested in
PLS HELP WILL GIVE BRAINLIEST :)
Rus_ich [418]

Step-by-step explanation:

the slope intercept form is

y = ax + b

"a" being the slope, "b" being the y- intercept (which is the y-value when x = 0).

the slope here :

in the table x is always increasing by 2.

and y is always investing by 1.

so, the slope is 1/2

the y-intercept :

we need to find the y-value for x = 0.

but we don't have a data point with x = 0 in the table.

so, we have to extend the structure of the table to the left.

x decreases by 2 (making it 0), and y decreases by 1 (making it -1).

therefore, the y- intercept (b) is -1.

and the line equation is

y = (1/2)x - 1

not sure about "the other method".

there is the point-slope form of the equation :

y - y1 = a(x - x1)

again with "a" begin the slope, and (x1, y1) being a point on the line.

if we get the y-intercept in the table, then this point is (0, y1).

and the equation would be

y - y1 = ax

in our case

y + 1 = (1/2)x

and another method ?

sometimes people write

nx + my = c

in our case starting with the original equation

y = (1/2)x - 1

2y = x - 2

-x + 2y = -2

x - 2y = 2

6 0
2 years ago
Let g(x)=5x-1 and h(x)=X^2-1<br> Solve:<br> g(h(x))=74
AURORKA [14]

Answer:

Let's replace the h(x) function in g(x) and then use 74 as a result on the axis y. The correct answer is 4 .

4 0
3 years ago
Find the area of the figure.<br><br> PLS I NEED HELP FAST!
Rom4ik [11]

55 ft

base + base2 / 2 x h

8 0
2 years ago
What scale factor was used in the dilation ????? Helpppppp
slava [35]

Answer:

5

Step-by-step explanation:

Dilation = dividing original by (number) to = dilated version.

10/5=2

Dividing 10 by 5 to = 2

(10=original size) (2=dilated size)

8 0
3 years ago
Escribe una ecuación que represente la tabla.<br><br> por favor respondan ^^
jarptica [38.1K]
Un ecuacion es y = 12 + x.
6 0
2 years ago
Other questions:
  • |−6.24|+|−2.47|=what
    6·1 answer
  • Which expression is equivalent to −4.6+(−0.4)+(−7.2) ?
    12·2 answers
  • Which of the following is a composite number?
    13·2 answers
  • X + 3 = -1 Prove x<br> Need help I need to see work. Don’t understand this problem.
    5·1 answer
  • Tameka ran one lap around a circular track that had a diameter of 20.5 feet. How far did she run? Round your answer to the neare
    8·1 answer
  • Suppose U1 and U2 are i.i.d. Unif(0,1) withU1=0.1 and U2=0.8. Use the "cosine" version of Box-Muller to generate a single Nor(-1
    11·1 answer
  • A. If a spacecraft was parked on Venus and needed to make a flight to Jupiter, how far would it need to travel? Show your work a
    6·1 answer
  • 2(w-1)+8=6(2w-4) please help w=?
    15·1 answer
  • Rectangle PQRS is dilated by a scale factor of 2 (k=2) with the origin as the center. What are the coordinates of R('?
    10·1 answer
  • Sreya bought shoes for $37.57 and x pairs of socks for $1.95 each. Which expression shows the total money spent?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!