Question

the perimeter of two similar triangles are 30cm and 20cm resp. if one side of the frst triangle is 20 cm, determine the corresponding side of the second triangle

Answer 1

Given,
perimeter of triangle(first)               =30 cm
perimeter of triangle (second)        =20 cm
one side of the first triangle            =20 cm 
other side of the second triangle    ="x" cm

by using the formula,

perimeter of first triangle/perimeter of second triangle=side of first triangle/side of second triangle

30/20=20/x
x=20*20/30
x=13.333......................
x=13.4(app)

Hence, the side of second side of triangle is 13.4

Answer 2

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