Answer
100 $in^{2}$
Work Step by Step
We need to find out the area of a parallelogram JKLM
Lets take base LK = 10 in
Height = 10 in
By theorem 8.1.2 The area A of a parallelogram with a base of length b and corresponding altitude of length h is given by A=bh
Area = 10 * 10
= 100 $in^{2}$