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Two sides of a triangle have lengths ‘a’ and ‘b’ and the angle between them is (theta).what value of (theta) will maximize the area of the triangle? Find the maximum area of the triangle also.

taniska , 11 Years ago
Grade 12
anser 2 Answers
Sher Mohammad
Notice that, since 0 < sin? <= 1 for 0° < ? <= 90°:
(1/2)ab(0) < (1/2)absin? <= (1/2)ab(1)
==> 0 < (1/2)absin? <= (1/2)ab.

maximum area is (1/2)ab
when ?=90
Last Activity: 11 Years ago
Vasantha Kumari
We know that the area of a triangle with sides ‘a’ and ‘b’ is A = ½ abcosq.

If we consider A’ to be maximum area of the triangle then the angle is 90° or ½ abcosq = 0.

i.e., when q =90°, the triangle has maximum area.(triangle is a right triangle)

The condition is opposite for minimum area, cosq =90° or angle q =0°.

Thanks & Regards,

Vasantha Sivaraj,

askIITians faculty

Last Activity: 11 Years ago
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