The semi-perimeter of a triangle whose three sides are 9 cm, 15 cm and 6 cm respectively is * A)20cm B)10cm C)15cm D)30cm
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3
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Answer:
15
Step-by-step explanation:
S= a+b+c/2
a=9cm
b=15cm
c=6cm
9+15+6/2
= 30/2
=15cm
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