To identify lines of symmetry in 2-D shapes
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Key learning points
- In this lesson, we will revise the names of different types of 2D shapes. We will explore what symmetry is and how to recognise lines of symmetry in 2D shapes. We will develop strong mathematical language about shape and we will investigate lines of symmetry in a variety of quadrilaterals and triangles.
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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
I have 4 sides. I have 4 right angles. Opposite sides are equal. Not all sides measure the same. What shape am I?
Square
Trapezium
Q2.
I am a triangle. All sides are a different length. One angle is 90° degrees. What kind of triangle am I?
Isosceles
Scalene
Q3.
I am a quadrilateral. I have no right angles. Opposite sides are parallel. What shape could I be?
Pentagon
Square
Q4.
How many sides do 5 quadrilaterals have altogether?
15
4
Q5.
What do each of the angles in a rectangle measure?
180°
80°
5 Questions
Q1.
How many lines of symmetry does a square have?
2
3
Q2.
Triangles have 3 lines of symmetry
always true
never true
Q3.
Another name for a line of symmetry is....
A diagonal line
A parallel line
Q4.
How many lines of symmetry does a regular octagon have?
6
7
Q5.
How many lines of symmetry does this shape have?
5
none