Page 226 - Math Smart - 7

CHAPTER 10.1

In this chapter
hapes and Solids
Pupils should be able to:
• Identify, describe,
visualise and draw 2D
shapes in different ^ RECALL
orientations
• recognise and describe Look at the polygons below. Write their names in the space below.
common solids and
some of their properties J L
j
• name and identify side,
angle and symmetry 1 r
properties of special
quadrilaterals and
triangles, and regular
J " L
polygons with 5, 6 and
k
8 sides

n ,. r

A 2D shape is a flat shape that has two dimensions, height and width, but no depth.

.c
U)
'a>
The orientation of a 2D
shape is a description of
how the shape is placed in width width
the space It occupies. The
A solid has three dimensions: A flat shape has two
properties of these shapes
height, width and depth. dimensions: height and width.
have not changed. They Hence, it is called a 3D shape. Hence, it is called a 2D shape.
are drawn in different
positions.
These shapes are closed shapes known
as polygons.
They have four straight sides.
So, they are also known as quadrilaterals.

UNIT 10 I Shapes and Symmetry