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Answer: 56cm
Step-by-step explanation:
AM= DC= 7cm
AB=AM+MB
13=7+MB
MB=6cm
By Pythagoras theorem in ΔCMB,
CB²=CM²+MB²
10²=CM²+6²
CM²=100-36=64
CM=8cm
Therefore, area of shaded region = 7 x 8 = 56cm
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