find the area of a triangle, 70cm, 80cm and 90cm using heron's formula
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Step-by-step explanation:
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THE VALUE S = (70 + 80 + 90)/2 = 240/2 = 120 cm
THE HERON'S FORMULA IS = √[S*(S-70)*(S-80)*(S-90)]
√[120*50*40*30] = 100√[12*5*12] = 1200√5 cm^2
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