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Rectangles and squares are 2D shapes, or polygons. Cuboids and cubes are 3D shapes, or polyhedrons. There are many words used to describe polygons and polyhedrons, such as angles, radius and circumference. But what do these words mean? You will have learned about them in your classes; now test how much you have remembered.

Enjoy playing this quiz on shapes.

1.

What is the name given to the distance from the center of a polygon or circle to one of the vertices?

Circumference

Diameter

Radius

Tangent

The diameter is twice the radius

2.

How many degrees in a right angle?

60^{o}

90^{o}

180^{o}

360^{o}

There are 360^{o} in a full turn so a quarter turn will be 90^{o}

3.

What is a seven sided polygon called?

Heptagon

Hexagon

Pentagon

Tetrahedron

A **hepta**gon has 7 sides and a **hepta**gram is a star with 7 points

4.

What is the name of the triangle with all sides and all angles equal?

Right angled triangle

Isosceles triangle

Equilateral triangle

Pyramid

An equilateral triangle has angles of 60^{o} at each of its corners

5.

Which of these describes an isosceles triangle?

Triangle with 3 equal sides

Triangle with 2 equal sides and 2 equal angles

Triangle with 3 equal sides and 2 equal angles

Triangle with 2 equal sides and 3 equal angles

An isosceles triangle has 2 equal angles which are opposite to 2 sides of equal length

6.

What is a polyhedron?

A 3D shape where all faces are square

A 3D shape where all faces are flat polygons

A 2D shape where all angles are different

A 2D shape with twelve sides

Cubes and cuboids are both polyhedrons

7.

How many sides does an octagon have?

5

6

7

8

To help remember this, think of an octopus with 8 legs

8.

Which of these is a regular polygon?

Rectangle

Right angled triangle

Square

Circle

A regular polygon has all sides equal

9.

What is the name of all flat shapes with three or more straight sides?

Triangle

Polyhedron

Polygon

Heptagon

So triangles, squares, rectangles and pentagons are all polygons

10.

What is the name given to a shape that has four faces all of which are equilateral triangles?

Tetrahedron

Polyhedron

Prism

Pyramid

Tetrahedrons are similar to pyramids, but pyramids have 5 faces, one of which is a square