### CAT / #Quantitative Ability

October 06, 2017 @ 10:49 AM

October 06, 2017 @ 10:49 AM

# Quantitative Ability - Volume and Surface Area (Important Formulas)

Published : Friday, 6 October, 2017 10:45 AM

CUBOID

Let length = l, breath = b and height= h units. Then

i. Volume =(lxbxh) cubic units.

ii. Surface area =2(lb+bh+ih) sq.units.

iii. Diagonal = 12 + b2 + h2 units.

CUBE

Let each edge of a cube be of length a. Then,

iv. Volume = a3 cubic units.

V. Surface area = 6a2 sq. units.

vi. Diagonal = 3a units.

CYLINDER

Let radius of base = r and height (or length) = h. Then,

vii. Volume = (πr2h) cubic units.

viii. Curved surface area = (2πrh) sq. unit.

ix. Total surface area = 2πr (h+r) sq. unit.

CONE

Let radius of base = r and height = h. Then,

X. Slant height, l = h2 + r2 units.

Xi. Volume = (1/3 πr2h) cubic units

xii. Curved surface area = (πrl) sq. units.

xiii. Total surface area = (πrl + πr2) sq. units.

SPHERE

Let the radius of the sphere be r. Then,

xiv. Volume = (4/3 πr3) cubic units

xv. Surface area = (4π r2) sq. units.

HEMISPHERE

Let the radius of a hemisphere be r. Then,

xvi. Volume = (2/3 πr3) cubic Units.

xvii. Curved Surface area = (2πr2) sq. units.

xviii. Total Surface area = (3πr2) sq. units.

Note: 1 liter = 1000cm3.

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