Sector theorem - PowerPoint PPT Presentation

6.8

6.8. Areas of Circles and Sectors. r. Theorem 6.20: Area of a Circle. The area of a circle is p times the square of the radius. 6.8. Areas of Circles and Sectors. Use the formula for area of a circle. Example 1. Find the indicated measure. Area. Solution.

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EXAMPLE 1

a. Area. = π (2.5) 2. r = 2.5 cm. ANSWER. The area of A is about 19.63 square centimeters. Use the formula for area of a circle. EXAMPLE 1. Find the indicated measure. SOLUTION. A = π r 2. Write formula for the area of a circle. Substitute 2.5 for r. = 6.25π.

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EXAMPLE 3

315 = Area of V. Solve for Area of V. The area of V is 315 square meters. mTU. Area of sector TVU = Area of V. 360 °. 40 °. 35 = Area of V. ANSWER. 360 °. Use the Area of a Sector Theorem. EXAMPLE 3.

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