Chapter 11 Review

Find the circumference of the circle.

• 28.26 in.
• 14.13 in.
• 63.585 in.
• 9 in.

Find the area of the semicircle.

• 692.37 cm²
• 2769.48 cm²
• 1384.74 cm²
• 131.88 cm²

FIND THE ARC LENGTH OF THE BOLDED ARC

• A
• B
• C
• D

Find the area of the shaded sector of circle O. The radius is 6 inches and the central angle is 100°. Express answer to the nearest tenth of a square inch.

• 25.2 in²

• 28.5 in²

• 31.4 in²

• 38.2 in²

What is 5π/6 radians in degrees?

• 180
• 150
• 360
• 120

What is 7π/4 radians in degrees?

• 300
• 135
• 315
• 45

What is 45 degrees in radians?

• π/2
• π/6
• π/4
• 3π/4

Find the area of the figure after halving the dimensions.

• 9

• 12

• 36

• 18

A rectangle has a base 4 ft and height of 5 feet. If the figure dilated by a scale factor of 2, what will be true about its area?

• The area is doubled.
• The area is multiplied by 4.
• The area stays the same

A figure is multiplied by the scale factor 1/4. What will be the change in area?

• The area will be 1/4 the original area.
• The area will be 1/8 the original area.
• The area will be 1/16 the original area.