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# Week 8 - 9 Properties of shape

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. Recap – Turns and angles
2. Recap – Right angles in shapes
3. Recap – Compare angles
4. Identify angles
5. Compare and order angles
6. Recognise and describe 2-D shapes
7. Triangles
9. Symmetry
10. Recap – Horizontal and vertical
11. Lines of symmetry
12. 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’.
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