The two angles of a triangle are 30° and 80°. Find the third angle o – InterviewSolution

1.

The two angles of a triangle are 30° and 80°. Find the third angle of this triangle.

Answer»

Let ∆ABC is a triangle where ∠B = 30° and ∠C = 80°.

Now, ∠B + ∠C = 30° + 80° = 110°

∵∠A + ∠B + ∠C = 180° or ∠A + 110° = 180° or ∠A = 180° – 110° = 70°

Thus, third angle is 70°.

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