10-7 Areas of Circles and Sectors

What is the area of this circle?

• 4π

• 8π

• 16π

• π

What is/are the formula(s) to find the area of a circle?

• πr²

• 2πr

• √π

What is the area of the shaded region in terms of π?

• 8π/3

• 2π/3

• 32π/3

• 4π/3

What is the area of this circle?

• 12π

• 6π

• 144π

• 36π

What is the radius of a circle with an area of 49π?

• 49

• 10

• 7

• 14

Name the circle part shown in green

• Sector

• Arc

• Segment

• Radius

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.

• 9.2 sq. in.
• 10.5 sq. in.
• 31.4 sq. in.
• 38.2 sq. in.

Challenging Question:

What is the area of the shaded segment?

• 185.0619

• 88.9359

• 39.3078

• 5.7975

Challenging Question

What is the area of the shaded region? Leave your answer as an exact value.

• 28.5

• 21.5

• 34.3

• 84.3