The area of the square is 9, the area of all the semi circles added together is 15.7, when you add them together you get 24.7
Angle C and the 112 degree angle are supplementary, so angle C measures 180-112=68 degrees.
This means that by the exterior angle theorem, 
Length times width times height
6*9*2
104
Look at the picture.
The area of the hexagon is equal six times the area of the <span>equilateral triangle.
The formula of the </span><span>equilateral triangle with the leg
a:

Therefore the formula of the area of the hexagon with a side lenght
a is:

We have
a = 12cm. Substitute:

</span>
Answer:
8,000^3
Step-by-step explanation:
volume is l x w x h
20 x 20 x 20 = 8,000