math question i need explanation mostly

Answer:
62 in^2.
Step-by-step explanation:
We can do this by working out the area of each of the 6 rectangles and then adding them up.
The area of a triangle = width * length.
Reading from left to right and top to bottom:
Total area = 7 * 1 + 3 *1 + 7 *3 + 3*1 + 7*1 + 7*3
= 7 + 3 + 21 + 3 + 7 + 21
= 10 + 24 + 28
= 62.