🎓 Deeper Dive — Adults

Mensuration computes lengths, areas, volumes of plane and solid figures.

2D essentials: rectangle (lw), triangle (½bh), circle (πr²), trapezium (½(a+b)h), parallelogram (bh).

3D essentials: cube (s³), cylinder (πr²h), sphere ((4/3)πr³), cone ((1/3)πr²h).

Always check units — area is square units (m²), volume is cubic (m³). Mensuration is heavily tested in CAT, SSC, and Bank PO papers.