National curriculum content

• Compare and classify geometric shapes, including quadrilaterals and triangles, based on their properties and sizes
• Identify acute and obtuse angles and compare and order angles up to two right angles by size
• Identify lines of symmetry in 2-D shapes presented in different orientations
• Complete a simple symmetric figure with respect to a specific line of symmetry

Lesson objectives

1. Understand angles as turns
2. Identify angles
3. Compare and order angles
4. Triangles
5. Quadrilaterals
6. Polygons
7. Lines of symmetry
8. Complete a symmetric figure

What we want children to know

• Know angles are a measure of a turn.
• Know that a right angle is a quarter turn, 2 right angles make a half-turn, 3 right angles make three-quarters of a turn and 4 right angles make a complete turn.
• Identify whether an angle is greater than or less than a right angle in shapes and turns, by measuring, comparing and reasoning in practical contexts.
• Learn that an acute angle is more than 0 degrees and less than 90 degrees, a right angle is exactly 90 degrees and an obtuse angle is more than 90 degrees but less than 180 degrees.
• Recognise, describe and draw 2-D shapes accurately.
• Classify triangles using the names ‘isosceles’, ‘scalene’ and ‘equilateral’.
• Identify and find horizontal and vertical lines in a range of contexts.
• Find and identify lines of symmetry within 2-D shapes.

What skills we want children to develop

Use knowledge to solve reasoning and problem solving questions such as:

Concrete and Pictorial Resources

Look at the hands of the clock.

Turn the minute hand one quarter of a turn clockwise. Where is the large hand pointing? What is the new time?

Real Life Maths

Children create a ‘Right Angle Tester.’

They can then go on a right angle hunt around school. Find and draw at least 3 right angles you have seen around your school.

Explanation

Teddy describes a shape.

Teddy says, “My shapes has 3 right angles and 2 obtuse angles.”

What could Teddy’s shape look like?

 Describe a shape in terms of its angles for a friend to draw.

Mathematical Talk

• If we start by facing ________ and make a _______ turn, what direction will we be facing?
• Where can you see a right angle in the classroom/ around school/ outside?
• Which shapes contain right angles?
• Can you see an acute/obtuse angle around the classroom?
• How many degrees are there in a right angle?
• Draw an acute/obtuse angle.
• How many angles does a _______ have?
• What are the names of the different types of triangles?
• Can you draw your own shape that has a horizontal and vertical line of symmetry?
• Explain what you understand by the term ‘symmetrical’.