 The name given to the distance from the centre of a polygon or circle to one of the vertices is radius.

# Shapes (Year 4)

As children progress through KS2 they will learn more about shapes in Maths. As well as knowing the basic 2D and 3D shapes, in Year Four children will be taught some more advanced shapes, such as heptagons, octagons, and tetrahedrons. They will also learn some of the different types of triangle, such as equilateral, and will be taught some of the words used to describe shapes, like polygons (used to describe 2D shapes) and polyhedrons (used to describe 3D shapes).

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 of the triangle with all sides and all angles equal?
Right angled triangle
Isosceles triangle
Equilateral triangle
Pyramid
An equilateral triangle has angles of 60o at each of its corners
2.
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
3.
Which of these is a regular polygon?
Rectangle
Right angled triangle
Square
Circle
A regular polygon has all sides equal
4.
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
5.
How many degrees in a right angle?
60o
90o
180o
360o
There are 360o in a full turn so a quarter turn will be 90o
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.
What is the name given to the distance from the centre of a polygon or circle to one of the vertices?
Circumference
Diameter
Tangent
The diameter is twice the radius
8.
What is a seven sided polygon called?
Heptagon
Hexagon
Pentagon
Tetrahedron
A heptagon has 7 sides and a heptagram is a star with 7 points
9.
How many sides does an octagon have?
5
6
7
8
To help remember this, think of an octopus with 8 legs
10.
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

Author:  Amanda Swift