The semiperimeter of an isosceles triangle is 20cm.if two of its equal sides are 15cm, the third side is?
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Answer:
10 cm
Step-by-step explanation:
s.perimeter=perimeter/2
20cm =p/2
p=20×2
=40cm
sum of 2 sifes of triangle =15cm+15cm(2equal sides are 15 cm)
which is eqal to 30 cm now
p=sum of 3 sides
40cm=15+15+3rd side
40-30=3rd side
10cm=3rd side answer
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