
Figure 2 shows a right pyramid with a horizontal square base of side 8 cm. The vertical height of the pyramid is
cm and
cm.
Find the exact value of .
Find, to 1 decimal place, the size of the angle between and the plane
.
Find, to 1 decimal place, the size of the angle between the plane and the plane
.
The midpoint of is
and
is the point on
such that
Show that cm.
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