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The sum of the perimeters of an equilateral - Quantitative Aptitude - CAT Geometry

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The question below is from previous year CAT question from CAT 2020 exam comes from CAT Geometry: The sum of the perimeters of an equilateral triangle and a rectangle is 90 cm, The longer side of the rectangle, is ?

Find out by answering this question which tests an aspirant’s Quantitative Ability Skills

CAT 2020 - Slot 2 - Quantitative Aptitude - Geometry - Question 16 - The sum of the perimeters of an equilateral

Q. 16: The sum of perimeters of an equilateral triangle and a rectangle is 90 cm. The area, T, of the triangle and the area , R, of the rectangle, both in sq cm, satisfy the relationship R = T2. If the sides of the rectangle are in the ratio 1 : 3, then the length, in cm, of the longer side of the rectangle, is

1. 27
2. 18
3. 21
4. 24

Correct Answer:  27 (option 1)

Sides of the rectangle are in the ratio 1 : 3

Take as x and 3x

Area of Rectangle = = R

Take an equilateral triangle with side a

Now from the options longer side 3x = 27

x = 9. Sides of the rectangle are 9 and 27.

If x = 9, Then a = 6

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