7th Grade Math - Perimeter & Area (Set 3)

Question 1

The areas of two equilateral △'s are in the ratio 25:26. Their altitudes will be in the ratio.

Accepted Answer

5:6

Answer

25:36

Answer

36:25

Answer

$\sqrt{5}:\sqrt{6}$

Question 2

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

Accepted Answer

$\frac{100}{\sqrt{3}}cm^2$

Answer

$\frac{100}{3}cm^2$

Answer

$30cm^2$

Answer

$100cm^2$

Question 3

If the side of an equilateral △ is decreased by 20%, its area is decreased by

Accepted Answer

36%

Answer

37%

Answer

40%

Answer

60%

Question 4

If the sides of a △ are 5cm, 4cm & $\sqrt{41}$cm, then the area of the △ is

Accepted Answer

$10cm^2$

Answer

$20cm^2$

Answer

$(5+4+\sqrt{41})cm^2$

Answer

$\frac{5+4+\sqrt{41}cm^2}{2}$

Question 5

The area of a △ is $216cm^2$ and its sides are in the ratio 3:4:5. The perimeter of the △ is

Accepted Answer

72cm

Answer

52cm

Answer

62cm

Answer

42cm

Question 6

If the perimeter of a right-angled isosceles △ is $(6+3\sqrt{2})m,$ then the area of the △ will be

Accepted Answer

$4.5cm^2$

Answer

$5.5cm^2$

Answer

$6.5cm^2$

Answer

$7.5cm^2$

Question 7

A parallelogram has sides 30m, 70m, and one of its diagonals is 80m long. Its area will be

Accepted Answer

$1200\sqrt{3}m^2$

Answer

$600m^2$

Answer

$600\sqrt{3}m^2$

Answer

$1200m^2$

Question 8

The area of a rhombus is $128cm^2$ and its perimeter is 32cm. The altitude of the rhombus is

Accepted Answer

16cm

Answer

17cm

Answer

18cm

Answer

15cm

Question 9

What is the area of a right-angled isosceles △ whose hypotenuse is ?

Accepted Answer

$18cm^2$

Answer

$12cm^2$

Answer

$16cm^2$

Answer

$19cm^2$

Question 10

The area of a rhombus, one of whose diagonals measures 8cm and the side is 5cm is

Accepted Answer

$24cm^2$

Answer

$25cm^2$

Answer

$26cm^2$

Answer

$27cm^2$

CHAPTER-11 PERIMETER AND AREA (SET-3)

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