Question

triangle ABC is an isosceles triangle with AB=AC . If angle B =40° , what are the measures of angle A and angle C

Answer 1

A=100 and C=40
Ab=Ac so angle B = angle C=40 degree becoz triangle is isoceles so
Sum of all angle of triangle are 180degree
So 40+40-180=100
Angle A=100 degree
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Answer 2

Heya!
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↪Refer to the Attachment for the figure ↪

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◾Given that , ∆ABC is an isoceles triangle .
◾ AB = AC .
◾Measure of Angle B = 40°

⭐Now , if Angle B = 40°

Then Angle C = 40° [ Angles opposite to equal sides are equal ]


◾Now we can apply Angle Sum Property to find Angle A => x

x + 40 + 40 = 180

x + 80 = 180

x = 180 - 80

x => 100°



✔Angle C = 40°

✔Angle A = 100°
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