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2 years ago

Cho tam giác ABC vuông tại A đường giao AH biếtAH=12cm BH=9cm.Tính diện tích tam giác ABC

Mathematics

1 answer:

Lostsunrise [7]2 years ago

6 0

Answer:

Step-by-step explanation:

AB^2 = HB^2 + AH^2 => AB = 15cm

Ta co cong thuc: 1/AH^2 = 1/AB^2 + 1/AC^2 => AC=20cm

Vay SABC= 1/2 .AB.AC = 1/2 .15.20=150cm^2

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