Question

6. If a = 12, b = 9, C = 15 then area of triangle by Heron's formula is__
a) 64 Sq.m
b) 74 sq.m
c) 54 sq.m
d) none
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Answer 1

Answer:

d) none

Step-by-step explanation:

s=a+b+c÷2

s=12+9+15÷2

s=36÷2

s=18

by herons formula

$\sqrt{s(s - a) + (s - b) + (s - c)}$

$\sqrt{18(18 - 12) + (18 - 9) + (18 - 15)}$

$\sqrt{18 \times 6 + 9 + 3}$

$\sqrt{18 \times 18}$

$\sqrt{324}$

=18

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