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OleMash [197]
3 years ago
14

I need help with number 5

Mathematics
1 answer:
GREYUIT [131]3 years ago
5 0
The domain is all the ones under the x and the range are the numbers under the y (that goes fo any question like that)
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ABCDE is a convex pentagon. Given AB = 5, BC = 12, AE = 13, DE = 8, CD = 6, and m∠B=m∠D=90°. Find the area of ABCDE.
vodka [1.7K]

The diagonals AC and EC of the pentagon forms two right triangles and

on isosceles triangle, together which gives the area of the pentagon.

Correct response:

  • The area of the convex pentagon is <u>104 square units</u>.

<h3>Methods used to finding the area of a pentagon</h3>

The given parameters are;

AB = 5

BC = 12

AE = 13

DE = 8

CD = 6

m∠B = m∠D = 90°

Required:

The area of the convex pentagon ABCDE

Solution:

The area of pentagon ABCDE = Right ΔABC + Right ΔCDE + ΔACE

Area of right triangle ΔABC = \frac{1}{2} × 5 × 12 = 30

Area of right triangle ΔCDE = \frac{1}{2} × 6 × 8 = 24

Length of AC = \mathbf{\sqrt{\overline{AB}^2 + \overline{BC}^2}}

Which gives; AC = \mathbf{\sqrt{5^2 + 12^2}} = 13

Length of EC = \mathbf{\sqrt{\overline{CD}^2+ \overline{DE}^2}}

Which gives; EC = \mathbf{\sqrt{6^2 + 8^2}} = 10

Therefore, ΔACE is an isosceles triangle

Base of ΔACE = EC

Therefore;

Height of isosceles triangle ΔACE = \mathbf{\sqrt{13^2 - 5^2}} = 12

Area of ΔACE = \mathbf{\frac{1}{2}} × 10 × 12 = 60

Therefore;

  • Area of the convex pentagon ABCDE = 30 + 24 + 60 = <u>104</u>

Learn more about finding the area of geometric figures here:

brainly.com/question/2279661

6 0
2 years ago
2900 dollars is placed in an account with an annual interest rate of 9% Wirte an equation that calculates how many dollars will
valentinak56 [21]

Answer:

The amount that will be in the account will be $(2900 +261x)

Step-by-step explanation:

We know that the amount of money that will be in the account will be a sum of the initial principal ($2900) and the interest that is accrued after x years.

Since we already know the principal, we will have to calculate the interest that is accrued after x years.

we can use the formula:

Interest = (principal X rate X time)/ 100

Interest = (2900 \times 9 \times x)/100=261x

Therefore the amount that will be in the account will be $(2900 +261x)

6 0
3 years ago
Can you help me with this?​
DochEvi [55]

Answer:

I need some more context

Step-by-step explanation:

5 0
3 years ago
What is r ÷ 6 = 14 what is r
Vladimir [108]

Answer:

R is 84

Step-by-step explanation:

6 times 14 is 84 and 84 divided by 6 is 14

6 0
4 years ago
Read 2 more answers
How many inches are in 7 and 1/2 feet?
Over [174]

Answer:

90 inches

Step-by-step explanation: 7 feet*12 inches= 84 and .5 feet*12 inches= 6.

84 inches+ 6inches=90inches

4 0
3 years ago
Read 2 more answers
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