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dddddddiicc
@dddddddiicc
March 2022
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Помогите пожалуйста даю 15 баллов
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MrLapik
1)Так как
△ABC - Равнобедренный, то AB = BC
Значит
∠
ABD =
∠CBD = 20°
2)AD = DC (По условию)
Сумма углов треугольника равна 180°
∠А = ∠C = (180° - ( ∠ABD + ∠CBD))/2 = (180° - ( 20° + 20°))/2 = 140° / 2 = 70°
Ответ: ∠А = 70°
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Answers & Comments
Значит ∠ABD = ∠CBD = 20°
2)AD = DC (По условию)
Сумма углов треугольника равна 180°
∠А = ∠C = (180° - ( ∠ABD + ∠CBD))/2 = (180° - ( 20° + 20°))/2 = 140° / 2 = 70°
Ответ: ∠А = 70°