Warm up Ð1. What is 1?m

Ð2. What is 2?m

Ð3. What is ?m ABC»4. What is ?mBE

Ð5. What is ?m BDE

2 Types of Answers

Rounded• Type the Pi

button on your calculator

• Toggle your answer

• Do NOT write Pi in your answer

Exact• Pi will be

in your answer

AreaThe amount of space occupied.

r A= pr2

Find the EXACT area.

2841 ft1.r = 29 feet

2.d = 44 miles2484 mi

Find the area. Round to the nearest tenths.

2181.5 yd 22206.2 cm

Example 3

If S has a diameter of 10 inches, find the area of the circle to the nearest hundredths.

A = 78.54 in2

Sectorthe region bounded by two radii of the

circle and their intercepted arc.

Area of a Sector

2measure of arc

360A r

Example 4 Find the area of the sector to the nearest hundredths.

A 18.85 cm2

606 cm

Q

R

Example 5 Find the exact area of the sector.

6 cm

120

7 cm

Q

R

249A cm

3

Example 6

Find the area of a sector with a central angle of 45° if the diameter of the circle is 12 inches. Round to the nearest hundredths. A 14.14 in2

Example 7 A spinner is divided into 12 equal

sections and the radius of the spinner is 4 inches. Every other section is shaded. Find the exact total area of the shaded region on the spinner.

A = 8 in2

Classwork

Worksheet20

ProblemsRound to 2 decimal

places

HomeworkFinish the Worksheet

20 Problems

Round to 2 decimal places