What is the measure of a base angle of an isosceles triangle if its vertex angle measures 40°? a) 70° b) 65° c) 140° d) 75°

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asked Mar 17, 2018 76.4k views

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Debashish · Answer 1 · 2018-03-18T04:58:32+0000

Hello,
The sum of the angles or any triangle is always going to be 180°
So if the vertex angle is 40°, then each base angle is:
180 = 40 + 2x
x = (180 - 40) / 2
x = 70°

The answer is A.

Bye :-)

What is the measure of a base angle of an isosceles triangle if its vertex angle measures 40°? a) 70° b) 65° c) 140° d) 75°

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