Page 89 - Mathematics Coursebook

8.1 Recognising and describing 2D shapes and solids

) Exercise 8.1

1 Copy and complete the table to show a description of the 2D quadrilaterals.
The parallelogram has been done for you.

One pair Two pairs One pair of Two pairs
Four equal Two pairs of All angles
Quadrilateral of parallel of parallel opposite of opposite
sides equal sides 90°
sides sides angles equal angles equal
Square
Rectangle
Parallelogram
Rhombus
Kite
Trapezium

2 Write down the name of each 2D shape that is described.
a ‘I have three sides. All my angles are different sizes and all my sides are different lengths.’
b ‘I have four sides. Two of my sides are the same length. The other two sides are the same
length. Opposite sides are different lengths. Two of my angles are the same, but the other two
are different.’
3 This card has an isosceles triangle and a circle drawn on it.

The card is turned three times. Copy the diagram and draw the missing triangle on each of the cards.
4 Copy and complete the table to show a description of the 3D solids.
The cone has been done for you.

Solid Number of faces Number of edges Number of vertices
Cube
Cuboid
Square-based pyramid
Triangular-based pyramid 4 6 4
Triangular prism

5 Write down the name of the solid shape that is being described.
‘When you cut me in half, the number of faces on one of my halves is double the number of faces
that I started with.’

6 Which two solid shapes can be joined together to form a
new shape that has three faces, two edges and one vertex? Vertices is the plural of vertex, so
one vertex means one corner.

88 8 Symmetry