Page 59 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

In this triangle two of its sides are equal.
1
Area of isosceles triangle = x Base x Height
2
Where
base = 2.b
s = One of equal sides (or) Slant height
2 2
h = Height = S − b
2 2
Area of isosceles triangle = x 2b x S − b

2
2
= b. S − b unit²
(Where b= half of base)
1
2
(or) Area of Isosceles triangle = x b b 4a − b 2 unit²
4
a = Equal sides
b = Base
iii Equilateral triangle
In this triangle all the three sides are equal. Hence angle between adjacent sides is 60º (because no. of angles)

180
total = 180º ; angle between sides = = 60º
60
3

3
Area of equilateral triangle = x side²
4
3
= x a² unit²
4
Where 3 = 1.732
4
Perimeter P = 3a unit
3
P P = = a unit
2

iv Scalene triangle
In this triangle the sides are not equal. Angles between the sides, are also not equal. we may also call this triangle
as irregular triangle.

46

CITS : WCS - Electrical - Exercise 5