Page 339 - NUMINO_WB_5B

090-P4-1

1. Look at the picture and solve the questions.
a cm

h cm

b cm
a. Express the area of the trapezoid as an algebraic expression.

b. The trapezoid has an area of 45 cm2, and a height of h cm, top side length of
a cm, and bottom side length of b cm. Complete the following table.

Height Top side Bottom side Area
1 30 (30 b) 1 2 45, b 60 45
3 10 45
5 6 45
6 5 45

c. The trapezoid has an area of 45 cm2, and a height of 10 cm, top side length of
3 cm, and bottom side length of b cm. Express the area as an expression and
find the value of b.