Parts of a Circle Worksheet

We have a set of 4 different worksheets to help you learn the parts of a circle. There is also a printable cheat sheet which includes a diagram and definitions for you to print.

Using these sheets will help your child to:

• identify and name the different parts of a circle
• know the definitions for the different parts of a circle

• Radius - a straight line from the center of the circle to the edge.
• Diameter - a straight line from one side of the circle to the other, going through the center of the circle.
• Circumference - the outside of the whole circle (the perimeter of the circle).
• Tangent - a line outside the circle which touches the circle at one point on the edge.
• Arc - part of the outside of the circle.
• Sector - an area of the circle enclosed by two radii.
• Chord - a straight line starting at one point on the circle and ending at another point on the circle.
• Segment - an area of the circle enclosed by a chord.
• Secant - a line outside the circle which goes through the circle touching it in two places, creating a chord.

Here is a printable version of our diagram.

There are 3 versions:

• a labelled diagram with definitions
• a labelled diagram without definitions
• a blank diagram without labels.

These parts of a circle sheets have been graded by level of difficulty.

Sheet 1 involves naming the following parts:

• radius
• diameter
• circumference
• sector
• arc
• chord

Sheet 2 involves naming all the parts of the circle

Sheet 3 involves selecting the correct word for each definition and then filling in the missing labels on the diagram.

Here you will find a support page packed with a range of geometric formula.

Included in this page are formula for:

• areas and volumes of 2d and 3d shapes
• interior angles of polygons
• angles of 2d shapes
• triangle formulas and theorems

This page will provide a useful reference for anyone needing a geometric formula.

Here you will find a support page to help you understand some of the special features that triangles have, particularly right triangles.

Using this support page will help you to:

• understand the different types and properties of triangles;
• understand how to find the area of a triangle;
• know and use and apply Pythagoras' Theorem.

All the free printable geometry worksheets in this section support the Elementary Math Benchmarks.

Here you will find a List of different Geometric Shapes.

Included with each shape is a small picture and a description of the properties the shape has and how it relates to other shapes.

Included in this page are the following shapes:

• triangles
• quadrilaterals
• regular polygons
• irregular polygons
• a range of 3d shapes

All the printable Geometry worksheets in this section support the Elementary Math Benchmarks.

Here you will find our range of Free Nets for 3D Shapes.

The following printables contain nets of common 3D shapes that your child should know. Each net sheet is available both with and without tabs to aid sticking together.

Using these sheets will help your child to:

• know the properties of different 3d shapes;
• recognise different 2d shapes inside the 3d shapes;
• construct a 3d shape from a net;
• recognise 3d shapes in different orientations and sizes;
• experience the fun and wonder of creating a 3d shape from a net.

The Math Salamanders hope you enjoy using these free printable Math worksheets and all our other Math games and resources.

We welcome any comments about our site or worksheets on the Facebook comments box at the bottom of every page.