The Southern African Large Telescope (SALT) is housed in a cylindrical building with a domed roof in the shape of a hemisphere. The height of the
building wall is 20 and the diameter is 12 m. To program the ventilation
system for heat, air conditioning, and dehumidifying, the engineers need the
amount of air in the building. What is the volume of air in the building.
Answer may be in terms of pie.

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

umumumumum

im not sure

pi x^2

step-by-step explanation:

pi times x squared