Identify properties of triangles | Maths | Quizalize & Oak National Academy

Starter quiz

Which of these images shows a right angle?

a ✓

b

c

d ✓
A right angle is the same as a ______ turn.

quarter ✓

half

three-quarter

whole
How many right angles does this shape have?

0 ✓

1

2

3
Look at this triangle. Which of these statements are true?

The shape does have reflective symmetry. ✓

The shape has 1 line of symmetry. ✓

The shape has 2 lines of symmetry.

The shape has 3 lines of symmetry.
Which letter does not have at least one right angle?

E

H

T

Z ✓
Which shapes have at least one right angle?

a

b ✓

c

d

Exit quiz

The corners of a shape are called the ______.

properties

symmetry

vertices ✓

right angles
Which of these shapes are triangles?

a ✓

b

c

d ✓
Which of these statements are true for all triangles?

They have 3 straight sides. ✓

They have 3 rounded vertices.

They have two sides the same length.
Which triangle is exactly the same size and shape as shape a)?

b

c

d ✓

e
Which triangles have one right angle?

a ✓

b ✓

c

d
Which triangles have at least two sides the same length?

a

b ✓

c

d ✓

Worksheet

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Video

Lesson Details

Key learning points

Triangles always have three sides, vertices and angles.
Triangles always have straight sides and sharp vertices.
Triangles can have right angles.
Vertices are the corners of a shape.

Common misconception

Pupils may see other shapes and collections of lines as triangles when they are not (e.g. shapes with rounded corners, three lines that do not all meet).

Provide pupils with shapes, and explore shapes in the environment, classifying them as 'triangles' and 'not triangles'. Ask children, 'Does this shape have three straight sides? Does it have clearly defined, sharp vertices?'

Keywords

Triangle - A polygon with three straight sides.
Vertex - The point where two lines meet.
Vertices - More than one vertex.
Properties - A character or quality that something has.