If the vertex angle of an isosceles triangle is 3x and the base angles have a sum of 7x. What is the measure of base angle?

40°

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20°

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63°

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68°

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Solution

The correct option is C
63°

The sum of the angles of a triangle is 180°. The angles opposite the equal sides of a triangle are equal.

7x+3x=180°

10x=180°

x= 18°

Base angles= (7*18/2)°=63°

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