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sabirzelenaovz2iy

№5.

Так как Δ равнобедренный ∠Р=∠S=50°.

Найдем ∠R=180-50-50=80°.

Найдем третий угол в ΔSRA. ∠А=90° так как SA -высота.

180-90-80=10°

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