a regular octagon is inscribed in a circle with a radius of 5 feet. what is the area of the octagon?

a) 72.3
b) 76.5
c) 71.5
d) 70.7

Step-by-step explanation:

Alright, lets get started.

Please refer the diagram I have attached.

There will be 8 triangles made.

The center angle will be =

The triangle will be formed an isosceles triangle, so remaining angle will be :

opposite= CD =

Similarly,

adjacent = BD =

The complete AB will be =

Area of triangle ABC will be =

So, the area of octagon will be 8 times area of this triangle.

Area of octagon will be =

Hence are the area of octagon is  70.70 :   Option D  :   Answer

Hope it will help :)

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this

found it xd it ok yt