# Two Dimensional Shapes

Two dimensional shapes are shapes that are flat. One group of two dimensional shapes with which we shall deal here are called polgons. A polygon is a many sided shape with straight edges and angles. The Shorter Oxford English Dictionary says that it is usually more than four sides.

A regular polygon is one whose sides are all the same length and whose angles are all the same sides. Any shape incorporating a curve, such as a circle or semi-circle, is not a polygon.

The names of shapes are generally derived from the latin. These include shapes such as an octagon (8 sides) or an icosagon (20 sides). Eventually though, we get to a point where people would not know what you were talking about if you said the different names for all the shapes. In order to make these more comprehensible to a wider audience, the names of shapes incorporate numbers (determined by the number of sides) with the suffix "agon" fixed to the end. An example of this would be a 97-agon which would have 97 sides.

## Knowledge of Shapes

This is a spreadsheet with some question about shape. The spreadsheet marks the questions. You can move from one exercise to another by clicking the tabs at the bottom of the worksheet. On some of the worksheets, the colour changes to green if you enter the correct answer. On others, it tells you to try again or correct.

## Describe shapes to a partner

This is a pdf file which provides combinations of shapes for people to describe to each other. The aim is to increase the vocabulary use around shape. Students should be encouraged to use words like parallel and perpendicular as well as the names of several shapes.

## Can you make the fish swim horizontally?

This is quite a challenging activity although good fun. The students have to make a fish from a triangle and a circle. They will need a paper clip and some string with which to hang their fish. The aim is to get the fish to swim horizontally which requires some thought about how big the tail needs to be and how large the body should be. There are instructions and a possible solution provided with the second sheet so don't print it back to back.

## How to find the co-ordinates of isosceles triangles

This is an exam prep on isosceles triangles and how to find the co-ordinates of the vectors that determine their size. The line of symmetry is used to help to find the pertinent co-ordinates. This is an explanation of how you answer the questions as opposed to lots of questions.

This is more of a how to do it sheet and does not include specific questions.

This provides information to allow children to sort shapes and particularly quadrilaterals by various criteria.

## Find the dimensions and the area of the shapes

Calculate dimensions and then find the area of various shapes.

## Find the area of rectilinear, triangular and trapezoid shapes

This pdf provides examples of how to calculate the area of triangles, rectangles and trapeziums. The next sheet is how to calculate the area of various examples of these shapes. The final couple of pages are using this knowledge to calculate the area of more complex shapes.

## Interactive Quiz on shapes

This quiz is a basic quiz on shapes. The aim is to help students to remember the names of shapes and parts of shapes. The questions are randomised and so the quiz should be different each time.

## Calculating the shortest side of a triangle

An example is given so that you know what to do. Then there are many questions to practise.