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Find the measure of any interior angle in a regular 15-gon (15-sided figure)

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Presentation on theme: "Find the measure of any interior angle in a regular 15-gon (15-sided figure)"— Presentation transcript:

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11 Find the measure of any interior angle in a regular 15-gon
(15-sided figure)

12 Find the measure of any interior angle in a regular 23-gon
(23-sided figure) Round to the nearest hundredth

13 Find the measure of any interior angle in a regular 30-gon
(30-sided figure)

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16 In a certain triangle, the measure of angle C is three times the measure of angle A, and the measure of angle B is the difference of the measures of the other two angles. Draw the triangle on scratch paper if necessary to determine the value of ‘x’. 3x + x + (3x – x) = 180 3x + x + 3x – x =180 6x = 180 x = 30 Write an equation to model this situation: Find the measure of angle A: x = 30 3x - x = 2x 2x = 60 Find the measure of angle B: Find the measure of angle C: 3x = 90 180 degrees Find the sum of angle A + angle B + angle C Classify this triangle by it’s angles Right triangle


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