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Find the radius of the circle inscribed in a triangle with sides 9 cm, 10 cm and 17 cm.

Class 10Tangent Lengths and IncirclesGeometry

A6 cm
B4 cm
C2 cm
D3 cm

Step-by-Step Solution

s = 18

cm. Heron: area =

18 \times 9 \times 8 \times 1 = 1296 = 36

cm

^{2}

. Area =

r \times s

, so

r = 36 \div 18 = 2

cm. 4 cm divides by 9 instead of

s

.

Answer: C) 2 cm

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