Answer: 17
Step-by-step explanation: 51 divided by 3
Answer:
A = 172.0 in²
Step-by-step explanation:
Exterior angle of any side is 360 / 5 = 72°
Interior angle between any two adjacent sides is 180 - 72 = 108°
A regular pentagon can be thought of as 5 isosceles triangles with two common angles of 108 / 2 = 54°
The height of each triangle is
h = (10/2)tan54
The area of each triangle is ½(10)h = ½(10)(10/2)tan54 = 25tan54
The area of the pentagon is
A = 5(25tan54) = 125tan54 = 172.04774005...
A = 172.0 in²