Question

What is the area of the polygon below

Answer 1

Look at the picture.
Area of a larger rectangle
$A_1=10\cdot17=170\ u^2$

Area of a smaller rectangle
$A_2=5\cdot6=30\ u^2$

Area of the polygon
$A=A_1-A_2\\\\A=170-30=140\ u^2$
Answer: A. 140 square units