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The width of a rectangle is 20 cm. The diagonal is 8 cm more than the length. Find the length of the rectangle.

A 20

B 21

C 22

D 23

Solution

Correct Answer: Option B

আয়তক্ষেত্রটির দৈর্ঘ্য xcm
 "                         '' কর্ণ (x+8)
∴(x+8)²=x²+20²
x²+16x+64=x²+400
16x=336
x=21

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