warm up. 2 types of answers rounded type the pi button on your calculator toggle your answer do not...

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