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Question


In ΔABC and A DEF, it is being given that: AB = 5 cm, BC = 4 cm and CA = 4.2 cm;
DE. 10cm, EF= 8cm and FD = 8.4cm. If ALBD and DMEF, find AL : DM.

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Solution

Given AB = 5 cm, BC = 4 cm, CA = 4.2 cm, DE = 10 cm, EF = 8 cm, and FD = 8.4 cm

We need to find AL : DM

fraction numerator A B over denominator D E end fraction equals fraction numerator B C over denominator E F end fraction equals fraction numerator A C over denominator D F end fraction equals 1 half

Since, the ratio of corresponding sides of both triangles are same, both the triangles are similar.

Here, we use the result that in similar triangle the ratio of corresponding altitude is same as the ratio of the corresponding sides.

Therefore, AL : DM = 1 : 2


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