Question

What is the area of the poster board that she has left

Answer 1

Area of a parallelogram = bh

The base is 20 and the height (given in the triangle) is 10

The area of the parallelogram is 200 square inches

The area of a triangle is 1/2bh

The base is 9 and the height is 20

The area of it is 90 square inches

200-90 square inches = 110 square inches left

Answer 2

Find the area of the parallelogram, find the area of the triangle, then subtract the triangle's area from the area of the parallelogram.

Area of Parallelogram:
A= base * height
A= 20 in * 10 in
A= 200 in^2

Area of Triangle:
A= 1/2 base * height
A= 1/2 (10 in)(9 in)
A= 1/2 (90)
A= 45 in ^2

Area of Poster Left:
subtract the difference
A= Parallelogram Area - Triangle Area
A= 200 in^2 - 45 in^2
A= 155 in^2

ANSWER: 155 in^2 is the area of the poster board she has left.

Hope this helps! :)