2D Mensuration Calculator – Area & Perimeter Mensuration Calculator for 2D Shapes Select Shape Shape: –Select a shape– Square Rectangle Circle Scalene Triangle Isosceles Triangle Equilateral Triangle Right Angle Triangle Rhombus Parallelogram Trapezium Square Inputs Side (a): Rectangle Inputs Length (l): Breadth (b): Circle Inputs Radius (r): Scalene Triangle Inputs Side a: Side b: Side c: Isosceles Triangle Inputs Equal Side (a): Base (b): Height (h): Equilateral Triangle Inputs Side (a): Right Angle Triangle Inputs Base (b): Height (h): Rhombus Inputs Diagonal 1 (d1): Diagonal 2 (d2): Side: Parallelogram Inputs Base (b): Height (h): Side (l): Trapezium Inputs Parallel Side a: Parallel Side c: Non-Parallel Side b: Non-Parallel Side d: Height (h): Calculate Results: