Toán Lớp 9: cho tam giac ABC, AB =12cm, BC =20 cm, AC = 16 cm. CM tam giac ABC vuông
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Toán Lớp 9: cho tam giac ABC, AB =12cm, BC =20 cm, AC = 16 cm. CM tam giac ABC vuông
Comments ( 2 )
AB^{2} = 12^{2} = 144
AC^{2} = 16^{2} = 256
BC^{2} = 20^{2} = 400
=>AB^{2} + AC^{2} = BC^{2}
=>ABC \triangle vuông (Pytago)