# 6.4.3 Surface Area of Three Dimensional Shapes, PT3 Focus Practice

Question 6:
Diagram below shows a right pyramid with a square base.

Calculate the total surface area, in cm2, of the right pyramid.

Solution
:

h2= 102 – 62
= 100 – 36
= 64
= √64
= 8cm

Total surface area of the right pyramid
= (12 × 12) + 4 × (½× 12 × 8)
= 144 + 192
= 336 cm2

 
       
Question 7:
 
Diagram below shows a prism.
 
 Draw to full scale, the net of the prism on the grid in the answer space. The grid has equal squares with sides of 1 unit.
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 Solution: