Question

find the area of the triangle whose sides are 7.5cm, 18 cm, 19.5 cm

Answer 1

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Answer 2

Answer: area = 67.5 cm²

Step-by-step explanation:

area of triangle = √[s(s-a)(s-b)(s-c)]

s = semi perimeter and a,b,c are sides pf the triangle

s = a + b + c/ 2

s = 7.5 + 18 + 19.5 / 2

s = 45 / 2 = 22.5

s-a = 22.5 - 7.5 = 15

s-b = 22.5 - 18 = 4.5

s-c = 22.5 - 19.5 = 3

so area = √[22.5 * 3 * 15 * 4.5]

=> √4556.25

=> 67.5 cm²