Question

Triangle with its three sides12 cm, 16 cm and 20 cm

Answer 1

Answer:

If you want perimeter

$12 + 15 + 20 = 47$

If you want area

semiperimeter - perimeter/2

$s = (12 + 15 + 20 )\div 2 \: = 23.5$

area

$area = \sqrt{23.5 \times 23.5 - 12 \times 23.5 - 15 \times 23.5 - 20}$

89.6 approx value

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