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Mathematical Formulas for IBPS CWE Numerical Ability

**IBPS CWE Numerical Ability Formulae.**

**VOLUME AND SURFACE AREA**

**IMPORTANT FORMULA FOR NUMERICAL ABILITY ( MATHEMATICS )**

**I. CUBOID**

Let length = 1, breadth = b and height = h units. Then, 1. Volume = (1 x b x h) cubic units.

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

3. Diagonal.=l2 +b2 +h2 units

**II. CUBE**

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

1. Volume = a3 cubic units.

2. Surface area = 6a2 sq. units.

3. Diagonal = 3 a units.

**III. CYLINDER**

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

1. Volume = ( r2h) cubic units.

2. Curved surface area = (2 rh). units.

3. Total surface area =2r (h+r) sq. units

**IV. CONE**

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

1. Slant height, l = h2+r2

2. Volume = (1/3) r2h cubic units.

3. Curved surface area = (rl) sq. units.

4. Total surface area = (rl + r2 ) sq. units.

**V. SPHERE**

Let the radius of the sphere be r. Then,

1. Volume = (4/3)r3 cubic units.

2. Surface area = (4r2) sq. units.

**VI. HEMISPHERE**

Let the radius of a hemisphere be r. Then,

1. Volume = (2/3)r3 cubic units.

2. Curved surface area = (2r2) sq. units.

3. Total surface area = (3r2) units.

Remember: 1 litre = 1000 cm3.

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