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4. Triangles
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Q5 of 186 Page 211

The perimeters of two similar triangles ABC and PQR are 32 cm and 24 cm respectively. If PQ = 12 cm, find AB.

Given that, ∆ABC ∼ ∆PQR

And perimeter of ∆ABC = 32 cm & perimeter of ∆PQR = 24 cm


We can write relationship as,



⇒


⇒


⇒ AB = 16


Thus, AB = 16 cm.


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3

In the given figure, ΔOAB ~ ΔOCD. If AB = 8 cm, BO = 6.4 cm, OC = 3.5 cm and CD = 5 cm, find (i) OA (ii) DO.

4

In the given figure, if ∠ADE = ∠B, show that ΔADE ~ ΔABC. If AD = 3.8 cm, AE = 3.6 cm, BE= 2.1 cm and BC = 4.2 cm, find DE.

6

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7

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Questions · 186
4. Triangles
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