Q. 25. If the 8th term of an A.P. is 37 and the 15th term is 15 more than the 12th term, find the A.P. Hence find the sum of the first 15 terms of the A.P.
Sol. 
Or
A square OABC is inscribed in a quadrant OPBQ of a circle as shownin Figure 4. If OA = 14 cm, find the area of the shaded region. 
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