Question

whether 9/4 square root of 231 is equal to 12.48

IF U CANNOT UNDERSTAND TRY TO SOLVE THIS

A triangle has 12cm,6cm,15cm.find its area using Heron's formula .

can u say which answer is correct
9/4 square root of 231
(or) 12.48

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Answer 1

Answer:

10.55 cm²

Step-by-step explanation:

A triangle has 12cm,6cm,15cm.find its area using Heron's formula.

P = 12 + 6 + 15 = 33 cm

Semi-perimeter s = 33 / 2 = 16.5 cm

A = $\sqrt{16.5(16.5-12)(16.5-6)(16.5-15)}$ = $\sqrt{16.5(4.5)(1.5)}$ = $\sqrt{111.375}$ ≈ 10.55 cm²