The area of the circle that can be inscribed in a square of side 10 cm is
(a) $40 \pi \mathrm{cm}^{2}$
(b) $30 \pi \mathrm{cm}^{2}$
(c) $100 \pi \mathrm{cm}^{2}$
(d) $25 \pi \mathrm{cm}^{2}$
We know that ABCD is a square of length 10 cm. A circle is inscribed in the square therefore, all the sides of the square are become tangents of the circle.
By, the tangent property, we have
$A P=P D=5$
$A Q=Q B=5$
$B R=R C=5$
$C S=D S=5$
If we join PR then it will be the diameter of the circle of 10 cm.
Therefore, radius of the circle = 5cm
$\therefore$ Area of the circle $=\pi r^{2}$
$\therefore$ Area of the circle $=\pi \times 5^{2}$
$\therefore$ Area of the circle $=25 \pi$
Therefore, area of the circle is $25 \pi \mathrm{cm}^{2}$.
Hence, the correct answer is option $(d)$.