There are 8 circle theorems in total, and they’re all facts about angles/lengths in particular situations all involving circles. The angle at the center is twice the angle at the circumference The angle in a semicircle is a right angle Angles in the same segment are equal Opposite angles in a cyclic quadrilateral sum to […]

# Category: Geometry

## Circles

Angles in the same segment A & B using same chord CD would always be equal. It means if the base is taken common to build two triangles on circumference of circle, then angles opposite to base would always be equal. Angles in the semi-circle are always 90 degree. It means if the base of […]

## Geometry – 3D Shapes Formulas

A 3D shape is a shape that is bounded by a number of surfaces or planes. These are also referred to as solid shapes. These shapes have height or depth unlike 2D shapes; they have three dimensions- length, breadth and height/depth and are therefore called 3D figures. For 3D shapes we measure Volume (V), Curved […]

## Geometry – 2D Shapes Formulas

A 2D shape is a shape that is bounded by three or more straight lines or a closed circular line in a plane. These shapes have no depth or height; they have two dimensions- length and breadth and are therefore called 2D figures or shapes. For 2D shapes, we measure area (A) and perimeter (P). […]