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Question

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 limh0ΔP3, 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 A 1128r
BD=r2(hr)2,AD=h
=2hrh2
AB=h2+2hrh2
=2hr

Now limh0ΔP3=limh012.h.22hrh2(22hr+22hrh2)3

=limh0h322rhh32(22r+22rh)3

=2r(22r+22r)3=1128r

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