Answer:
I think
A) 15
B) 20
C) 40
Explanation:
If you complete each square then divide your answer for the new completed side by 2 then add it to the whole then you should get your answer.
For example square one. Make a new line going down the right side the same as the left and now you have 1 square and 2 triangles.
Then close off each side triangle to make it a square which would look like a triangle was sandwiched on top of it to make it a square.
Now your base of 7 on the bottom is actually 2+3+2=7 because the segment on top breaks up the 7 into 3 in the middle and 2 on each other side.
So essentially you now have a 2 by 3 next to a 3 by 3 next to a 2 by 3 again.
Solve for the sides and divide those by two to get your area for those 2 sides.
which gives us 3 because 2x3=6 6/2=3
For each side added you get 3+3=6 So now all you need is the middle square which is 3x3=9
This gives us 6+9=15
This is how you would do the other 2 squares. Finish the triangle to make it a square to get the area for that. Then divide by 2.
The easiest way to do it without much math
I think