Explanation

Surface area of cuboid = 2(lw + wh + hl)  

Where l = length, w = width, h = height

Given: l = 6cm, w = 4cm, h = 3cm

lw = 6 × 4 = 24  

wh = 4 × 3 = 12  

hl = 3 × 6 = 18

Add them: 24 + 12 + 18 = 54

Multiply by 2: 2 × 54 = 108

Surface area = 108 cm²

Last verified on 10-06-2026

Explanation

An isosceles triangle is a triangle with two sides of equal length.

If all three sides are equal, it is called an equilateral triangle.

A scalene triangle has all sides of different lengths, and a right triangle has one right angle (90 degrees).

Last verified on 15-03-2026

Explanation

Formula: Area = 1/2 × base × height

base = 10 cm

height = 12 cm

Area = 1/2 × 10 × 12

     = 5 × 12

     = 60 cm²

Last verified on 10-06-2026

Explanation

Sum of interior angles = (n − 2) × 180°

Given sum = 1260°  

So (n − 2) × 180 = 1260  

n − 2 = 1260 / 180 = 7  

n = 7 + 2 = 9

9 sides = nonagon

Last verified on 09-06-2026

Explanation

Surface area = 4πr², Volume = 4/3πr³.  

Surface area is just derivative of volume w.r.t r.

2πr is circumference of a circle, not volume at all.

Last verified on 07-06-2026