Page 62 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

2
= 3 x 5 − 3 2
= 3 x 25 − 9
= 3 x 16
= 3 x 4
= 12 cm²
o r
1 2 2
A = b b
b 4a −
4
1 2 2
b
= x 6 4 x 5 − 6
4
1
b
= x 6 x 8
4
= 12 cm²

5 Find its height if an isosceles triangle has base of 200 mm and its area is 2000 mm².
Base = 200 mm
Area = 2000 mm²
h = ?
1
x x b x h = A
bh
2
1
bh
x x 200 x h = 2000
2
200 x 2
h = = 20 mm
200
6 Find the area of an equilateral triangle whose side is 5 cm.

3
Area = a² unit²
4
1.732
= x 5 x 5
4

= 10.825 cm²

49

CITS : WCS - Electrical - Exercise 5