Find the angle
Triangle ABC is isosceles with AB = AC.
The angle at A is 40°.
What is the size of angle B?
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In an isosceles triangle, the base angles are equal.
ReplyDeleteSince AB = AC, the equal sides meet at A, so angles B and C are equal.
Total angles in a triangle = 180°
Angle A = 40°
So:
Angle B + Angle C = 180° - 40° = 140°
Because Angle B = Angle C:
Angle B = 140° ÷ 2 = 70°
Answer: 70°