dewildmonkey dewildmonkey

06-01-2017
Mathematics

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If ABC is an isosceles triangle with base , what is the measure of C?

If ABC is an isosceles triangle with base what is the measure of C class=

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djsdoodle djsdoodle

06-01-2017

Angle B is supplementary to the external angle of 60 degrees, so B = 120.
Since A+B+C = 180 for a triangle,
A+C = 180 - 120 = 60
And for an isosceles triangle, A=C, so
C+C = 60
C = 30
The answer is 30 degrees.

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