ABC is an isosceles triangle inscribed in a circle of radius r. If AB=AC and h is the altitude from A to BC, then evaluate limh→0ΔP3, where Δ is area of the triangle and P its perimeter.
A
1128r
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B
164r
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C
132r
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D
1256r
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Solution
The correct option is A1128r BD=√r2−(h−r)2,AD=h =√2hr−h2 AB=√h2+2hr−h2 =√2hr
Now limh→0ΔP3=limh→012.h.2√2hr−h2(2√2hr+2√2hr−h2)3