Basic Mathematics for College Students

Find the area of each trapezoid.See Example 9.

Solve each problem.See Example 10.

57. The area of a parallelogram is 60 m^2 , and its height is
    15 m. Find the length of its base.


58. The area of a parallelogram is 95 in.^2 , and its height is
    5 in. Find the length of its base.


59. The area of a rectangle is 36 cm^2 , and its length is
    3 cm. Find its width.


60. The area of a rectangle is 144 mi^2 , and its length is
    6 mi. Find its width.


61. The area of a triangle is 54 m^2 , and the length of its
    base is 3 m. Find the height.


62. The area of a triangle is 270 ft^2 , and the length of its
    base is 18 ft. Find the height.


63. The perimeter of a rectangle is 64 mi, and its length is
    21 mi. Find its width.


64. The perimeter of a rectangle is 26 yd, and its length is
    10.5 yd. Find its width.

13 mm

9 mm

4 mm 4 mm

7 cm

10 cm

3 cm 3 cm

7 cm

34 in.

28 in.

16 in.

12 ft

8 ft

4 ft

Find the area of each shaded figure.See Example 11.

65.

66.

67.

68.

Find the area of each shaded figure.See Example 12.

69.

70.

71.

10 yd 10 yd

5 yd

10 yd

25 cm

8 cm

15 cm

10 cm

14 m

3 m

3 m

6 m

18 mm

9 mm 9 mm

5 mm

20 ft

30 ft

2 ft

8 m

8 m

8 m

4 m

5 in.

6 in. 6 in.

12 in.

9.7 Perimeters and Areas of Polygons 789