# Difference between Circle and Sphere

Both the Circle & Sphere both being Circular objects, thus they create a lot of confusion in understanding them. Both seem to be similar but in reality, they have a huge difference between them. Let us have a deeper understanding of both the terms.

Key Differences-

• A circle is a two-dimensional figure whereas, a Sphere is a three dimensional object.
• A circle has all points at a same distance from its centre along a plane, whereas in a sphere all the points are equidistant from the centre at any of the axis.
• We can only determine the surface are in case of a Circle, while in Sphere we can calculate the surface area as well as volume.

Formulas-

Area of a Circle = $\pi r^{2}$

Area of a Sphere = $4 \pi r^{2}$

Volume of a Sphere = $\frac{4}{3} \pi r^{3}$

#### Practise This Question

In the figure, ABCD is a trapezium in which, AB || DC  and AOOC=BOOD=12 and AB=5 cm. Find the value of CD .