Search results

Refine results by

Year level
Resource type
Learning area

Refine by topic

Main topic Specific topic Related topic
Listed under:  Mathematics  >  Geometry  >  Shapes (Geometry)  >  Circles  >  Radius
Interactive resource

Trig radians: introduction

Use radians to measure angles. Identify key angles in their radian form, for example π/6=30°. Convert angles in degrees (up to 360) to angles in radians. Solve measurement problems using angles in radians. Determine arc lengths using radians. This learning object is one in a series of seven objects. Three objects in the ...

Interactive resource

EagleCat: spin graph

Investigate the beautiful patterns that can emerge from the locus of a point on one circle rolling around another circle. Investigate families of curves that can be produced by: (a) changing the size of the rolling circle only, (b) changing the size of the fixed circle only or (c) changing the position of the point only.

Interactive resource

Exploring dilations

Explore dilations by transforming shapes such as triangles and rectangles. Choose a scale factor and position a shape and dilation centre. Notice how the coordinates of the dilation image are related to the original image. Look at how scale factors enlarge or reduce the size of a shape. Identify a scale factor used to dilate ...

Teacher resource

TIMES Module 13: Measurement and Geometry: construction - teacher guide

This is a 30-page guide for teachers that explains the central role of construction and presents examples of constructions.

Teacher resource

TIMES Module 17: Measurement and Geometry: the circle - teacher guide

This is a 15-page guide for teachers. In the module the formulas for finding the circumference and area of a circle are introduced. The history and significance of the number pi is also included in this module.


How Global Positioning System (GPS) works

This teaching resource outlines an activity for students to use trilateration to mark and locate a position. Students use string and three stationary objects to mark a point, then move the string, and other students relocate the point. This activity models how three circles with different centres can only intersect at one ...

Teacher resource

Starting Smart: how can I use measurement relationships to solve problems? - years 7-9

This curriculum resource package is a ten-week middle years teaching plan and set of supporting resources to extend students' knowledge and skills in the measurement of area and volume and to develop their ability to solve practical measurement problems. Students use counting methods and develop formulas to calculate areas ...

Teacher resource


This is a website designed for both teachers and students that refers to the properties of circles including the circumference and area from the Australian Curriculum for year 8 students. It contains material on finding circumferences and areas of circles, and the areas and perimeters of shapes formed from circles and other ...

Teacher resource

reSolve: Area of a circle

This lesson explores the formula for calculating the area of a circle. Students estimate the area of a circle using inscribed and circumscribed squares, and investigate proofs of the area formula. Each lesson is outlined in detail including curriculum links, vocabulary, materials needed, sample answers, supporting PowerPoint ...

Teacher resource

reSolve: Circumference

This sequence of three lessons explores the properties of circles, in particular the relationship between the diameter and circumference. In the first lesson, students use a cylinder containing three tennis balls to understand that a circumference is 'three and a bit' times the diameter. They then complete five different ...