Find the area in square units of the shaded region.

Question

Find the area in square units of the shaded region.

25

21

15

11

A rectangle is centered inside a larger rectangle. The area between the larger rectangle and the smaller rectangle is shaded light blue. Four lengths are given.

1. The bottom horizontal side of the larger rectangle is labeled 25.
2. The right vertical side of the larger rectangle is labeled 15.
3. The top horizontal side of the smaller rectangle is labeled 21.
4. The left vertical side of the smaller rectangle is labeled 11.

Answer 1

Based on given information, measurements for larger rectangle on the outside are 25 and 15; measurements for the smaller rectangle on the inside are 21 and 11. Find the area for both.

Large Rectangle: Area = 15 x 25 = 375 sq. units

Small Rectangle: Area = 21 x 11 = 231 sq. units.

Subtract to find the are of the shaded region. 375 - 231 = 144 square units.