Page 61 - WCS - Electrical
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WORKSHOP CALCULATION & SCIENCE - CITS
2 Calculate the base of a triangle having an area of 15 cm² and height is 3.5 cm.
Area (A) = 15 cm²
Height (h) = 3.5 cm
Base (b) = ?
1
bh
x x b x h = A
2
1
bh
x x b x 3.5 = 15
2
15 x 2
b =
3.5
= 8.57 cm
3 Calculate the height of a triangle whose area is 60 cm² and base is 10 cm.
Area (A) = 60 cm²
Base (B) = 10 cm
Height (h) = ?
1
x x b x h = A
bh
2
1
x x 10 x h = 60
bh
2
60 x 2
h =
10
height h = 12 cm
4 Find the area of an isosceles triangle whose base is 6 cm long and each of the other two sides 5 cm long.
6
Base (b) = 6 cm = = 3 cm
2
Equal sides or
slant height ‘s’ = 5 cm
Area (A) = ?
2
A = b x S − b 2
48
CITS : WCS - Electrical - Exercise 5
