Page 358 - Math Smart - 7

d) e) f)

6.5 cm
50 mm
1 m

2 cm
4 cm
3 cm
200 mm 3 cm
2 cm

Remember to convert all dimensions to the same unit.

@ Calculate the surface area of this cuboid
a) incm^and /i = 5 cm
b) in mm^.

If the width of the cuboid is halved, what
w = 6cm
is the surface area of the cuboid in cm^?
/ = 8 cm

O* Challenge!
This bench is made by combining two cuboids.
Calculate the surface area of the bench that
needs to be painted.

4 cm
7 cm

2 cm 6 cm
O* Challenge!
Calculate the surface area of this open cube.
Hint: There is no lid.
Kim wants to paint the inside and outside
of the open cube. Calculate the total surface
area to be painted.
2 m

UNIT 15 Measuring Time, Area, Perimeter and Volume