Estimate of Circle's Area = 80% of Square's Area = 80% of 9 = 7.2 m2 Circle's True Area = ( π /4) × D 2 = ( π /4) × 3 2 = 7.07 m2 (to 2 decimals) The estimate of 7.2 m2 is not far off 7.07 m2 A Real World Example Example: Max is building a
Circumference is the perimeter of a circle. The formula for circumference isC=2πr. The formula for area of a circle isA=πr2. What is the formula in solving for the area of a circle?
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The formula to determine the area of the shaded segment of the circle can be written as radians or degrees. Area of segment of a circle (Radians) = 1 2. r 2 ( θ – s i n θ) Area