Maths Lesson Identify equal sides and angles in

Maths Lesson Identify equal sides and angles in symmetrical shapes

Mental starter Describe the properties of these shapes Remember to include Number of sides Types of angles Number of corners length of sides lines of symmetry

Identify equal sides and angles in symmetrical shapes These are the angles you may find inside the corners of your shapes.

Names of shapes

Regular pentagon 5 equal sides 5 corners 5 obtuse angles 1 vertical line of symmetry 4 diagonal lines of symmetry Circle One side No corners No angles Infinite lines of symmetry

Task If you have a printer: Print out the shapes on the next slide Cut them out and stick them into your book. Name the shape. Mark in their angles. Draw their line or lines of symmetry. Write their properties next to them as shown on the previous slide. If you do not have a printer. Draw this table into your book. The number of rows you draw depends on how many shapes you describe. Shape Name Number of equal sides Number of corners Types of angles Lines of symmetry Regular pentagon 5 equal sides 5 corners 5 obtuse angles 1 vertical line of symmetry Circle 1 side No corners No angles Infinite lines of symmetry

Answers as shapes are shown on previous slide -the position of lines of symmetry (vertical, horizontal or diagonal) depends on how you have stuck the shapes in. Shape Name Number of equal sides Number of corners Types of angles Lines of symmetry Regular pentagon 5 equal sides 5 corners 5 obtuse angles Rectangle 2 pairs of equal sides 4 corners 4 right angles Regular hexagon 6 equal sides 6 corners 6 obtuse angles Irregular pentagon 2 pairs of equal sides 5 sides in total 1 pair of equal sides 3 sides in total 5 pairs of equal sides 5 corners 3 right angles 2 obtuse angles 3 acute angles 1 vertical line of symmetry 4 diagonal lines of symmetry 1 vertical line of symmetry. 1 horizontal line of symmetry. 6 lines of symmetry 1 vertical 1 horizontal 4 diagonal 1 horizontal line of symmetry 1 vertical line of symmetry. 1 diagonal line of symmetry 10 lines of symmetry. 1 vertical 1 horizontal 8 diagonal Isosceles triangle Right angle triangle Decagon 3 corners 10 corners 1 right angle 2 acute angles 10 obtuse angles