Page 60 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

Area of triangle = S(S x2 − a)(S − b)(S − c) unit²
where
a,b,c are sides of triangle
a b + c +
s = Semi perimeter = unit
2

v Right angled triangle
In this triangle, angle between one of two adjacent sides is 900. Right angle means ninety degrees. That’s why
right angled triangle means, one of the angles of this triangle is definitely ninety degrees.

Area of right angled triangle
1
= x x Base x Height
bh
2
1
bh
= x bh unit²
2

Hypotenuse = Base 2 + Height 2
Where hypotenuse means, the diagonal or largest length of the side of right angled triangle.
Examples

1 Calculate its area if the base and height of a Right angled triangle are 10 cm and 3.5 cm respectively.
Base (b) = 10 cm
Height (h) = 3.5 cm
Area (A) = ?
1
bh
A = x x b x h
2
1
= x x 10 x 3.5
bh
2
= 17.5 cm²

47

CITS : WCS - Electrical - Exercise 5