2D Mensuration Last Updated : 09 Sep, 2025 Comments Improve Suggest changes 2 Likes Like Report 2D Mensuration is the branch of mathematics that deals with the measurement of various flat geometric figures and shapes. This includes calculating areas and perimeters of two-dimensional shapes like squares, rectangles, circles, and triangles.This mathematical discipline primarily involves determining:Perimeter: The total boundary length of shapes.Area: The surface coverage of plane figures.Mensuration TerminologiesHere are the terms you will come across in 2D mensuration. We have provided the term, abbreviation, unit, and definition for easy understanding.TermsAbbreviationUnitDefinitionAreaAm2 or cm2The surface that the closed form covers is known as the area.PerimeterPcm or mA perimeter is the length of the continuous line that encircles the specified figure.Mensuration Formula For 2D ShapesThe following table provides a list of all mensuration formulas for 2D shapes:ShapeArea (Square units)Perimeter (units)FigureSquarea24aSquare dimensionsRectanglel × b2(l + b)Rectangle dimensionsCircleπr22πrCircle with radiusScalene Triangle√[s(s-a)(s-b)(s-c)],Where,s = (a+b+c)/2a + b + cScalene triangle dimensionsIsosceles Triangle½ × b × h2a + bEquilateral triangle dimensionsEquilateral Triangle(√3/4) × a23aEquilateral triangle dimensionsRight Angle Triangle½ × b × hb + hypotenuse + hRight Angle Triangle dimensionsRhombus½ × d1 × d24 × sideRhombus DiagonalsParallelogramsb × h2(l + b)Parallelogram dimensionsTrapezium½ h(a + c)a + b + c + dTrapezium dimensions Create Quiz Comment S sugandha673c Follow 2 Improve S sugandha673c Follow 2 Improve Article Tags : Aptitude Quantitative Aptitude Explore Aptitude Questions and Answers 3 min read Quantitative AptitudeNumbers 8 min read Ages 5 min read Profit and Loss 5 min read Average - Solved Questions and Answers 6 min read Time Speed Distance 7 min read Logical ReasoningNumber Series 5 min read Statement and Argument 3 min read Alphanumeric Series 3 min read Theme Detection - Solved Questions and Answers 6 min read Letter Series 2 min read Verbal ReasoningDirection Sense 2 min read Verbal Analogies 2 min read Venn Diagrams 2 min read Blood Relation 5 min read Course of Action 2 min read Verbal AbilitySynonyms 1 min read Idioms and Phrases 5 min read Change of Speech 3 min read Cloze Test 2 min read Change of Voice 5 min read One Word Substitutes 3 min read Non-Verbal ReasoningMirror Image: Verbal Reasoning 5 min read Embedded Images 2 min read Pattern Completion 2 min read Non Verbal Reasoning : Paper Folding 6 min read Cubes and Dice Reasoning Questions: Practices, Tricks(PDF Download) 6 min read Picture Analogies Questions - Non Verbal Reasoning 4 min read PracticeOnline Aptitude Test: For Jobs, Placements, and More 5 min read Like