In a triangle ABC: AB is equal to BC, angle C is equal to 70 degrees AD is the bisector of angle A. Find the angle ADB.

univerkov | June 29, 2021 | education

If AB = BC, then triangle ABC is isosceles. Angle A = angle C = 70 °.

Apex angle B = 180 ° – (70 ° + 70 °) = 180 ° – 140 ° = 40 °.

Angle ADB = 180 ° – (angle BAD / 2 + angle B) = 180 ° – (35 ° + 40 °) = 180 ° – 75 ° = 105 °.

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