Q6.If the vertex angle of an isosceles triangle is twice
the sum of the base angles the measure of the vertex
angle of the triangle is:
O 100 degree
O 110 degree
O 120 degree
130 degree.
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3
Answer:
120°
Step-by-step explanation:
Sum= x+x
=2x
The other angle is twice the sum of base angles=2×2x
=4x
4x+2x=180°
6x=180°
x= 180°/6
= 30°
Therefore 4x=120°
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