For cross sections :
| Shape | Area formula | |-------|---------------| | Square (side = (s)) | (A = s^2) | | Equilateral triangle (side = (s)) | (A = \frac\sqrt34 s^2) | | Right isosceles triangle (leg = (s)) | (A = \frac12 s^2) | | Semicircle (diameter = (s)) | (A = \frac\pi8 s^2) | | Rectangle (height = (h), base = (s)) | (A = h \cdot s) | volume by cross section practice problems pdf
Base: region between (y = 1) and (y = \cos x) from (x=-\pi/2) to (\pi/2). Cross sections perpendicular to the x‑axis are rectangles of height 3. Find volume. For cross sections : | Shape | Area