Maths · Trigonometrical identities and trigonometrical functions
and Then is equal to
\( \ln \Delta A B C, B C=A B \) and \( \angle B=80^{\circ} \) Then \( \angle A \) is equal to
- A. \( 80^{\circ} \)
- B. \( 40^{\circ} \)
- C. 50^{\circ} \)
- D. \( 100^{\circ} \)
Step-by-step solution
In triangle ABC, BC = AB, so angles opposite these sides are equal: ∠A = ∠C. Given ∠B = 80°. Sum of angles is 180°, so ∠A + ∠C = 100°. Since ∠A = ∠C, each is 50°.
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