Triangle

Mensuration Important Terminologies

TermsUnitDefinitionsArea Square units The region enclosed by the 2D figure is called the area. Perimeter Linear units The length of the boundary of a 2D figure is called the perimeter. Volume Cubic units The measure of the amount of space that a three-dimensional object occupies, is usually expressed in cubic units. Curved Surface Area Square units The area of the outer surface of a three-dimensional object that has a curved surface, such as a cylinder or cone. Lateral Surface Area Square units The area of the outer surface of a three-dimensional object that does not include its top or bottom, such as the sides of a prism or cylinder. Total Surface Area Square units The sum of the area of all the surfaces of a three-dimensional object, including its base and top. Square Unit Square units A unit of measurement is used for area, where one unit is equivalent to the area of a square with sides of length 1 unit. Cube Unit Cubic units A unit of measurement is used for volume, where one unit is equivalent to the volume of a cube with edges of length 1 unit....

Triangle

Let the three sides of the triangle be a, b and c....

Rectangle

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Square

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Parallelogram

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Rhombus

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Trapezium

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Circle

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Mensuration 2D Formulas

ShapeArea Formula (Square Units)Perimeter Formula (Square Units)Square A = s² (where s is the length of a side) P = 4s (where s is the length of a side) Rectangle A = l × w (where l is the length, w is the width) P = 2(l + w) (where l is the length, w is the width) Circle A = πr² (where r is the radius) C = 2πr (where r is the radius) Scalene Triangle A = (b × h) / 2 (where b is the base, h is the height) P = a + b + c (where a, b, and c are the lengths of the sides) Isosceles Triangle A = (b × h) / 2 (where b is the base, h is the height) P = 2a + b (where a is the length of the equal sides, b is the length of the third side) Equilateral Triangle A = (√3 / 4) × a² (where a is the length of a side) P = 3a (where a is the length of a side) Right-Angled Triangle A = (b × h) / 2 (where b is the length of the base, h is the length of the height) P = a + b + c (where a, b, and c are the lengths of the sides) Rhombus A = (d₁ × d₂) / 2 (where d₁ and d₂ are the lengths of the diagonals) P = 4s (where s is the length of a side) Parallelogram A = b × h (where b is the base, h is the height) P = 2(a + b) (where a and b are the lengths of the parallel sides) Trapezium A = ((a + b) / 2) × h (where a and b are the lengths of the parallel sides, h is the height) P = a + b + c + d (where a, b, c, and d are the lengths of the sides)...

Sample Questions on Mensuration 2D

Q1: Find the perimeter and area of an isosceles triangle whose equal sides are 5 cm and height is 4 cm....

Related Resources:

Problems on Mensuration 2D | Set 2...

Also Practice:

Mensuration 3D Aptitude QuestionsAges Aptitude QuestionsProfit and Loss Aptitude QuestionsSimple Interest Aptitude QuestionsCompound Interest Aptitude Questions...