The area of the largest triangle that can be inscribed

Question:

The area of the largest triangle that can be inscribed in a semi-circle of radius r, is

(a) $r^{2}$

(b) $2 r^{2}$

(c) $r^{3}$

(d) $2 r^{3}$

Solution:

The triangle with the largest area will be symmetrical as shown in the figure.

Let the radius of the circle beĀ r.

Hence,

$a r(\Delta \mathrm{ABC})=\frac{1}{2}(r)(2 r)$

$=r^{2} s q$, unit

Therefore the answer is (a).

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