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If the side of an equilateral triangl...

If the side of an equilateral triangle is decreased by 20%, its area is decreased by (a) 36% (b) 40% (c) 60% (d) 64%

A

0.36

B

0.64

C

0.4

D

0.6

Text Solution

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The correct Answer is:
A
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S CHAND IIT JEE FOUNDATION-PERIMETER AND AREA -QUESTION BANK - 21(B)
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  2. The hypotenuse of a right-angled isosceles triangle is 5 cm. The ar...

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  3. What is the area of the given figure ? ABCD is a rectangle and BDE is ...

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  4. The ratio of bases of two triangles is x\ : y and that of their ...

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  5. If D and E are the mid points of the sides AB and AC respectively of t...

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  6. The perimeter of a right angled triangle is 60 cm. Its hypotenuse is 2...

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  7. The area of an equilateral triangle is 400sqrt(3) sq.m. Its perimeter ...

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  8. The areas of two equilateral triangles are in the ratio 25:36. Thei...

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  9. From a point within an equilateral triangle, perpendiculars drawn to t...

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  10. The height of an equilateral triangle is 10 cm. Its area is

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  11. An equilateral triangle is described on the diagonal of a square. W...

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  12. A square and an equilateral triangle have the same perimeter. If the d...

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  13. If the side of an equilateral triangle is decreased by 20%, its are...

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  14. If the sides of a triangle are 5 cm, 4 cm and sqrt(41) cm, then the ar...

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  15. The area of a triangle is 216 cm2 and its sides are in the ratio 3:...

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  16. In a triangular field having sides 30 m, 72 m and 78 m, the length of ...

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  17. If every side of an equilateral triangle is doubled, the area of the n...

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  18. If the perimeter of a right angled isosceles triangle is (6 + 3 sqrt(2...

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  19. If A be the area of a right triangle and b one of the sides containing...

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  20. Inside an equiangular triangular park, there is a flower bed forming a...

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