Question

The semiperimeter of an isosceles triangle is 20cm.if two of its equal sides are 15cm, the third side is?

Answer 1

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