You have to find the area of each face and add them all together. You also need to find the unknown side which is indicated in the picture i attached.
Answer:
k = 33
Step-by-step explanation:
7 + k/3 = 18
=>7 + k/3 -7 = 18 - 7
=>k/3 = 11
=>(k/3) * 3 = 11 * 3
=>k = 33
3/2^2 or 0.75 because you have to take the middle value (3), divide it in half, then square it. That would be 0.75.
