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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