The circles are tangent to one another and each circle is tangent to the sides of the right triangle $ABC$ with a right angle $ABC$. If the larger circle has radius $12$ units and the smaller circle has radius $3$ units. What is the area of the triangle?

All the circles are tangent to one another / or the sides of the rectangle. All circles have radius $1$. What is the area of the shaded region to the nearest whole unit, i.e. the region outside all the circles but inside the rectangle?

Given below are six congruent circles drawn internally tangent to a circle of a radius $21 unit$; each smaller circle is also tangent to each of its adjacent circles. Find the shaded area between the circle and the six smaller circles.

In the figure below, ${\mathrm{O}}_1$ and ${\mathrm{O}}_2$ are centres of the circles ${\mathrm{O}}_1\mathrm{A}$ is the circle centres at ${\mathrm{O}}_2$.

Find the area of the shaded region.

In the figure, which of the following is correct?

Given: $AB = BC$

$△PAB$ is formed by three tangents to circle $O$ and $\angle APB = 40°;$ then the $\angle BOA$ is equals to:

$\mathrm{PQRS}$ is a cyclic quadrilateral. The angle bisector of angle $\mathrm{P}, \mathrm{Q}, \mathrm{R}$ and $\mathrm{S}$ intersect at $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D}$ as shown in the figure below. Then these four points form a quadrilateral $\mathrm{ABCD}$ is a

In the given figure, $O$ is the centre of the circle; angle $BCO=mº$, angle $BAC = nº$.then which of the following is correct?

Find the area of shaded portion given that the circles with centres $O$ and $O^1$ are $6 cm$ and $18 cm$ in diameter respectively and $ACB$ is a semi circle.