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Question

AM=8x2,MC=2x2, then find BM and AB.
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Solution

It is given that ABC=900 and BMAC as shown in the above figure:

Now with AM=8x2 and MC=2x2, consider,

BM2=AM×MC=8x2×2x2=16x4BM=16x4=4x2

Similarly, with AM=8x2 and MC=2x2, consider,

AB2=AC×AMAB2=(AM+MC)×AMAB2=(8x2+2x2)×8x2AB2=10x2×8x2AB2=80x4AB=80x4AB=4x25

Hence, BM=4x2 and AB=4x25.

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