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Using Heron's formula, the area of a triangle with sides 3 cm, 4 cm and 5 cm is (in $cm^{2}$ ):

Competition practiceAreas & Volumes

A6
B12
C5
D7

Step-by-Step Solution

s = (3 + 4 + 5) \div 2 = 6

. Area = √

(s (s - a) (s - b) (s - c))

= √

(6 \times 3 \times 2 \times 1)

= √

36 = 6 cm^{2}

.

Answer: A) 6

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