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Areas of Circles and Sectors. 11.5. Theorem 11.7 Area of a Circle. The area of a circle is π times the square of the radius, or A=πr². Sector of a Circle. The region bounded by two radii of the circle and the arc they intercept. Theorem 11.8 Area of a Sector.
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Theorem 11.7Area of a Circle • The area of a circle is π times the square of the radius, or A=πr²
Sector of a Circle • The region bounded by two radii of the circle and the arc they intercept.
Theorem 11.8Area of a Sector • The ratio of the area A of a sector of a circle to the area of the circle is equal to the ratio of the measure of the intercepted arc to 360°. A = m arcAB or A = m arc AB ·πr² πr² 360° 360°
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Homework • Page 695 # 10 – 28, 33 - 37