60cm

1
F
E
C
B
30º
x
60cm
D
A
60cm
The diagram represents a prism. AEFD is a
rectangle. ABCD is a square. EB and FC are
perpendicular to plane ABCD. Calculate the size
of the angle that the line DE makes with the
plane ABCD. Give your answer to 1 decimal place.
35
30º
35
85
60
60
x
X
85
60
ROUNDED TOO EARLY!!
(3-D TRIGONOMETRY PYTHAGORAS)
2
F
E
C
B
30º
x
60cm
D
A
60cm
60tan30
30º
v7200
60tan30
60
60
x
v7200
60
(3-D TRIGONOMETRY PYTHAGORAS)