21. The perimeters of two similar triangles are 25cm and 15cm. If one side of the first the first triangle
is 9cm, find the corresponding side of the second triangle.
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Length of corresponding side of 2nd trangle
= length of side of 1st ( perimeter of 2nd/perimeter of first)
= 9×15/25= 135/25
= 5.4 cm
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