Check the picture below.
so, bearing in mind that, the radius and height are two sides in a right-triangle, thus both are at a ratio of each other, thus the radius is at 3:4 ratio in relation to the height.


Answer:
Let
and
.
a)

b)

c) Now we calculate the direction of
and 
We calculate the direction of
like this:
. Since,
, then the direction of
is
.
Now, for 
.
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