Hi koplan,

For the first question, you will need to use similar triangle to help you solve the answer.

Let's say r is the radius and h is the height. Then you will need to use similar triangle to write r in term of h (like comparing two fractions).

Then you need to derive the volume equation in terms of h.

Then you will probably need to plug in the h that you found when is half volume.

Question 2:

You will need to use sin function to derive.

Since sin t = opp/hyp

t is your angle

opp is the height

hyp is the ladder which is constant

Hope this help

Francis

Tutorat A+ Tutoring | Go for A+ , A big step toward the future.