Предложите план построения квадрата, периметр которого равен14 см.начертите этот квадрат

Р= а*а а= 14: 4 а= 7,5 см сторона квадрата

1,  найти сторону квадрата 14/4 = 3.5 cм 2. начертить квадрат

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Дано:   δавс                   решение:         ∠в=70°             1) рассмотрим  δвдс-прямоугольный ,т.к. сд⊥ав,           сд⊥ав               тогда  ∠вдс=90°                                   2)       найти:   ∠вдс=?           ∠всд= 180°-(70°+90°)=180°-160°=20°             ∠всд=?                 ответ: 90°,20°