hailiedegian hailiedegian

21-01-2021
Mathematics

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the 4 angles of heptagon equal and each of other 3 is 20° greater the first 4.Find the angles

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bexwhite2610 bexwhite2610

21-01-2021

Answer:

interior angle of a heptagon = 900 degrees

900 = 4x + (3x + 60)

840 = 7x

840/7 = 120

X = 120

120 X 4 = 480

120 X 3 = 360

480 + 360 + 60 = 900

4 angles = 120 degrees each

3 angles = 140 degrees each

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