KS2 Maths Quiz
A pentagon is not a quadrilateral.

# Shapes (Year 5)

In KS2 Maths as children advance to Year Five their knowledge of shapes will increase. By now they should know the names of the different 2D shapes from the circle to the decagon, and also many of the 3D shapes. They should also be able to recognise an equilateral, a right angle and an isosceles triangle and will now be taught about scalene and obtuse triangles and congruent shapes.

A circle and a triangle are both shapes. Did you know it is said that only a genius can draw a perfect circle? Have a go and see if you are a genius! There are various types of triangles, like Isosceles, scalene or equilateral, depending on the size of their angles.

Do you know the difference between an oblong and a rectangle? Can you tell an isosceles from a scalene triangle? See how much you remember about shapes by playing this quiz.

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1. If you cut a triangular prism in half, what shape would the new face be?
If you cut a triangle into two with a straight line, at least one of the two pieces will be a triange
2. What is the shape of the faces of a regular octahedron?
A regular octahedron would have equilateral triangles as each of its 8 faces
3. How do we know if two triangles are congruent?
If one shape can become identical to another by using turns, flips or slides but without changing the size, then the two shapes are congruent
4. What is the name given to a triangle with an angle larger than 90o?
Do you remember that angles between 90o and 180o are called obtuse angles?
5. What is an octahedron?
Remember that 'octa' means 8 and that 'hedron' means a 3D shape
6. What is the name given to polygons with all the sides and angles equal?
Irregular polygons are where the sides are not equal
7. What is the name given to the distance from one edge of a circle to the other through the centre?
The diameter is twice the radius
8. Which of these shapes is not a quadrilateral?
Pentagons have 5 sides - all the other shapes have just 4
9. What is an oblong?
A rectangle is a quadrilateral where all four sides are right angles
10. What is a triangle with no equal sides and no equal angles called?
Scalene comes from the Greek word for "unequal"

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