Cho bi?t AC = 21cm; HC = 3cm; Cl = 5cm. Tính z = AB? Bài 20. Cho tam giác ABC có AB=9cm; AC=12cm. Trên c?nh AB l?y ?i?m H và trên c?nh AC l?y ?i?m K sao cho AH = 6cm; AK = 8cm. a) Ch?ng minh HK//BC. b) Cho bi?t BC=18cm. Tính HK? c) K? trung tuy?n AM c?a tam giác ABC (M thu?c BC), AM c?t HK t?i. Ch?ng 1 minh r?ng 1 là trung ?i?m ?o?n HK.
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We are given that AC' = 2cm, HC = 1cm, and CI = 32cm. We need to find HK. Show more…
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