An isosceles triangle has 2 equal angles (base angles )
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The sum of all interior angles of a triangle add up to 180°,
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(3x+47)+ (5x+21)+ (5x+21) = 180
Solve for x:
3x+47+5x+21x+5x+21 = 180
Combine like terms:
3x+5x+5x+47+21+21 =180
13x+89 = 180
Subtract 89 from both sides of the equation:
13x+89-89 = 180-89
13x = 91
Divide both sides by 13
13x/13 = 91/13
x = 7
Replace x=7 for each degree measure:
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