Ineed to find the circumference of this shape for #31

Step-by-step explanation:

Assumptions

This isn't drawn exactly to scale I don't think. I also think you are intended to believe that the inscribed figure is a rectangle, but that is a huge assumption.

If I'm right and that is a rectangle then the diagonal of the rectangle is also the  diameter of the circle.

A diameter is also the hypotenuse of the two triangles formed by cutting the rectangle in half.

So let's go on.

Step One

Find the diagonal / hypotenuse.

a = 8 in

b = 6 in

c = ?

c^2 = a^2 + b^2

c^2 = 8^2 + 6^2

c^2 = 64 + 36

sqrt(c^2) = sqrt(100)

c = 10

Step 2

Find the radius of the circle

2*r = d

d = 10

2*r = 10

r = 10/2

r = 5

Step two

Find the circumference.

Circumference = 2*pi * r

Circumference = 2* pi * 5

Circumference = 10*pi      <<<<        Answer

That is one possibility for an answer

The other is to use 3.14 for pi

Circumference = 2*5*3.14 = 31.4  <<<< Answer

0 is its x and y coordinate