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
aev [14]
3 years ago
12

The square abcd has side length 10cm. E is the midpoint of BC. Work out the length of DE. Answer to 1 decimal place.

Mathematics
2 answers:
Levart [38]3 years ago
4 0

-- DEC is a right triangle.

-- DC is one side of the square  =  10 cm
-- EC is half the side of the square = 5 cm
-- DE is the hypotenuse = square root of (5² + 10²)  =  √(125 cm²) .

<em>-- Truncated</em> to one decimal place, that's  11.1 cm. 

<em>-- Rounded</em> to one decimal place, it's 11.2 cm.


borishaifa [10]3 years ago
4 0
Think of it as a triangle. E is the midpoint of BC, so EC is 5cm. Then CD is 10cm. Pythagoras it, so 5^2 + 10^2 = DE^2. Rt(125) = 11.2 to 1 decimal place. That's the answer
You might be interested in
When a number is tripled and 8 is subtracted from the result, the answer is 16. What is the number?
ivann1987 [24]

N(3)-8=16

add 8 to both sides

3n=24

Divide each side by three

n=8


6 0
3 years ago
HELP ME PLEASEEE!! <br><br><br><br><br><br> 48 degrees 96 degrees x =
Roman55 [17]

Answer:

144°

96+48(further away angles)

8 0
3 years ago
Read 2 more answers
Find the area of the shaded region.
Citrus2011 [14]

Answer:

pi × 18cm^2

Or approximately,

56.52cm^2 (using 3.14 for pi)

or

56.5487cm^2 (using pi button on calculator)

Step-by-step explanation:

Area of a circle is pi times [radius squared].

All circles are 360°.

Problem can be solved by finding area of whole circle, and then using ratios.

Whole Circle: area = pi × (9cm)^2 = pi × 81cm^2

80° / 360° = Area[shaded] / (pi × 81cm^2)

pi × 18cm^2 = Area[shaded]

((If you read my answer before the edit, I am sorry. I made a calculator error.))

3 0
3 years ago
Write a description of -5a + 3 &gt; 1 inequality
Andrej [43]

The sum of -5a and 3 is greater than 1

6 0
2 years ago
Eben, an alien from the planet Tellurango, kicks a football from field level. The equation for the football’s height in meters,
Luden [163]

<span>The maxima of a differential equation can be obtained by getting the 1st derivate dx/dy and equating it to 0.</span>

<span>Given the equation h = - 2 t^2 + 12 t       , taking the 1st derivative result in:</span>

dh = - 4 t dt + 12 dt

<span>dh / dt = 0 = - 4 t + 12   calculating for t:</span>

t = -12 / - 4

t = 3 s

Therefore the maximum height obtained is calculated by plugging in the value of t in the given equation.

h = -2 (3)^2 + 12 (3)

h = 18 m

This problem can also be solved graphically by plotting t (x-axis) against h (y-axis). Then assigning values to t and calculate for h and plot it in the graph to see the point in which the peak is obtained. Therefore the answer to this is:

<span>The ball reaches a maximum height of 18 meters. The maximum of h(t) can be found both graphically or algebraically, and lies at (3,18). The x-coordinate, 3, is the time in seconds it takes the ball to reach maximum height, and the y-coordinate, 18, is the max height in meters.</span>

6 0
3 years ago
Other questions:
  • What is the greatest common factor of 5x^6+35x^4+15x^3
    9·1 answer
  • What the answer to 8.247x10
    9·1 answer
  • Twenty men can cut thirty trees in four hours. If four men leave the job, how many trees will be cut in six hours?​
    13·1 answer
  • The larger of two numbers is 15 more than the smaller number. Five times the larger number is 40 more than twelve times the smal
    13·1 answer
  • Given cube inscribed in sphere with edges √243 cm. Find the volume of sphere
    13·1 answer
  • Mr. Ramsey orders lunches to be delivered to his workplace for himself and some
    8·2 answers
  • PLEASE HELP ME!!!!!!!!!!! NEED ANSWER IN LIKE 6 MINS!!!
    15·1 answer
  • The area of the rectangle below is<br> sq. units.<br> Help me pls :(
    10·2 answers
  • Sally has a game piece shaped like a square pyramid. The dimensions are shown in the net.
    10·1 answer
  • Can anyone help me find the area ty
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!