Page 226 - SK Year 5 Mathematics DLP

2 Name this regular polygon. Explain the
characteristics of this regular polygon.
A diagonal is a
corner corner straight line drawn
from one corner to
the opposite corner.
diagonal diagonal

corner corner

1 Name each polygon based on its characteristics.

a • 6 straight sides b • 3 straight sides c
which are closed of equal length • 7 corners
• all straight sides of • 3 equal interior • all straight sides
equal length angles of equal length
• 6 symmetrical axes • 0 diagonal • 14 diagonals

2 How many diagonals a b
are there in each
of these regular
polygons?

3 Complete the table below.

Number Number Number of Number
Regular of straight of symmetrical Number of
polygon of angles
sides corners axes diagonals
equilateral 3 3
triangle
square 4 4

pentagon 5 5

hexagon 6 6 9
heptagon 7 7 14

octagon 8 8 20

218 • Create a mobile project (dangling ornament) of regular polygons with their
6.1.1 characteristics and display them at the mathematics corner.
• Guide pupils to identify the number of diagonals for regular polygons.