If i have 4 right angles that means i have for perpendicular lines segments too right?

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.