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Question

A triangle ABC is similar to a triangle PQR. If the triangle ABC has sides with ratio of 3:4:5 and the shortest side of the triangle PQR is 6 cm, then find the length of the longest side of the triangle PQR.

A
5
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B
6
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C
8
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D
10
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Solution

The correct option is D 10
Given that the triangles ABC and PQR are similar. If two triangles are similar, the lengths of their sides are proprtional.

In the triangle ABC, sides are in the ratio 3:4:5.

Let the two unknown sides of trianlge PQR be x and y.
Ratio of lengths of the sides of the triangle PQR is 6:x:y.
3:4:5=6:x:yx=8, y=10

So, the longest side of the triangle PQR is 10 cm in length.

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