32. Now look at the cuboid again.
(3) Now consider triangle ACG.
(4) Calculate the length of AG. F
28cm
12cm
16cm A B C D E G H
30.5cm A G
30.5 16
AG = 34.4cm

33. Pythagoras & Pyramids. Consider the rectangular based pyramid below:
28cm is the slant height EC. A B C D E
12cm
7cm
28cm
Our task is to find the vertical height EF as shown. F
(1) Consider the triangle ABC.
(2) Calculate the length of AC. 12 7 A C B
AC = 13.9cm

34. Now look at the pyramid again:
(3) Now consider triangle EFC. A B C D E
12cm
7cm
28cm
13.9cm F
(4) Calculate the length of EF.
28cm
6.95cm E F C
Half of AC.
EF = 27.1cm

35. What Goes In The Box ? 2
Calculate the length of the required line below:
6.3m
3.2m 7m A B C D E
(2) F
Length EC. A B C D E
(1)
14.6 m
9.8 m
12.9 m
Length EF . F
Answer:
7.8m
Answer:
9.4m