Area and Perimeter Practice Test 2

Question : 22 of 40

Marks: +1, -0

If the sides of an equilateral triangle are increased by 20%, 30% and 50% respectively to form a new triangle, the increase in the perimeter of the equilateral triangle is:

25 %
$33 1/3$ %
50 %
100 %

Validate

Solution:

Let side of the equilateral triangle be x m; then perimeter = 3x m
Again, three sides of the triangle are 1.20x cm, 1.30x cm and 1.50x cm respectively; then
Perimeter = 1.20x + 1.30x + 1.50x = 4x cm
Change in perimeter = 4x – 3x = x cm
Required percentage =

x/{3x} × 100

33 1/3

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