The two equal angles of an isosceles triangles are (3x - 20) and (3x + 20), what is the measure of the greatest angle of this triangle?
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Step-by-step explanation:
the the third angle be x
as the sum of angles of a triangle is 180 degree
(3x - 20) + (3x+ 20) + x = 180
7x =180
x = 25.71
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