AD-bisector of triangle ABC, angle C = 70 degrees, angle BAD = 20 degrees Find angle B.
September 14, 2021 | education
| It is known:
ABC triangle;
AD – bisector of triangle ABC;
Angle C = 70 °;
Angle BAD = 20 °;
Find corner B.
1) Since the bisector divides the angle in half, then we find the angle A. For this, the angle BAD is multiplied by 2.
Angle A = 2 * angle BAD = 2 * 20 ° = 40 °;
2) Consider the triangle ABC.
2 angles are known.
Find corner B.
Angle B = 180 ° – 40 ° – 70 ° = 140 ° – 70 ° = 70 °.
As a result, we got that the angle B = 70 °.
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