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Listed under:  Perimeter

### Measuring our coastline

How long is the Australian coastline? See Dr Derek Muller and Simon Pampena discussing the perimeter of the Australian coastline. Find out how the accuracy of that measurement depends on the length of the 'measuring stick' used. They discuss how a coastline is much like a fractal such as 'Koch's Snowflake'!

### HOTmaths: exploring areas of rectangles and squares

Do rectangles with larger areas also have longer perimeters? Explore the relationship between the area and perimeter as the length and width are altered. Follow an investigation path using the HOTsheet.

### Exploring diameter and circumference

Explore the constant value of 'pi' by investigating the relationship between circumference and diameter. Unroll the circumference of a circle to form a straight line. See how many times the diameter can be placed beside it. Notice the relationship between the circumference and diameter applies no matter what size the circle ...

### Using 'Area and perimeter' - Teacher idea

This Teacher idea relates the experiences of teaching R11472 'Area and perimeter - unit of work' both with students in a regular year 3 class and with others online in a virtual classroom. Through digital resources and hands-on tasks the unit explores the early concepts of perimeter and area, including the introduction ...

### 'Giant tree at Neerim, forty feet girth', c1889

In this brown-and-white photograph two men are measuring the circumference of a giant eucalypt tree while a third looks on. They are holding a tape measure about 150 cm above ground level, at which height, according to the caption, the tree has a girth of 40 feet (12.2 m). Undergrowth behind the tree and a lot of branches ...

### 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.

### Giant hole: climb through a hole in a sheet of paper

This teaching resource outlines an activity for students to explore the relationship between the area and perimeter of a shape, by using a series of cuts in a piece of paper to create a hole large enough to step through. The resource includes detailed instructions for creating the cuts in the paper, an explanation of how ...

### 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 ...

### Perimeter and area

This is a six-page HTML resource about solving problems with perimeter and area. It contains one video and nine questions, five of which are interactive. The resource discusses and explains solving problems with area and perimeter to reinforce students' understanding.

### Enlargement transformations

This is a website designed for teachers and students in year 5, and addresses components of the enlargement transformations topic in geometry. It is particularly relevant for the concept of enlarging two-dimensional shapes and also contains material on enlarging drawings using grid paper. There are pages for both teachers ...

### Circles

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 ...

### Numeracy wrap: Round the outside

In this resource students will calculate the perimeter of different shapes, choose the appropriate measuring device, make different shapes from given perimeters

### Sites2See – measurement for primary

Selected links to a range of interactive and print resources for Measurement topics in K-6 Mathematics.

### Geoboard

This iPad app is a tool to create line segments, vertices and polygons using coloured bands on a pegboard. There are two board sizes - a standard 25-peg board and a 150-peg board that allows a greater number and diversity of configurations. The bands come in eight colours and the shapes created can be filled with a transparent ...

### reSolve: Area of a circle

This sequence of three lessons explores the formula for calculating the area of a circle. Students estimate the area of a circle using inscribed and circumscribed squares, investigate proofs of the area formula, engage in activities for further exploring circle area in multiple contexts and investigate a 'square peg' problem ...

### 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 ...