### Circles, Triangles & Rectangles

Circles are two-dimensional round shapes. A circle has no sides, which means it is infinite in all directions. Circles are usually drawn with a compass around a point on the paper. Circles are a mathematical shape with a continuous boundary. They have the same radius at every point which enables them to rotate around a single point, called the center.

Triangles are two-dimensional shapes that have three distinct sides connected by lines or angles. They can be equilateral (all three sides are equal), isosceles (two of the three sides are equal) and scalene (the side lengths do not measure up to each other). Triangles can also be right-angled, obtuse-angled and acute-angled.

A rectangle is a two-dimensional shape that can be defined as an object with four straight sides, the length of which is different than the width. A rectangle is made up of two lines that are perpendicular to each other and share the same endpoint. Rectangles are very commonly used in architecture and design because they are readily available to construct with straight edges.

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