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Q:

# If the radius of a circle is decreased by 50% , find the percentage decrease in its area.

 A) 75% B) 65% C) 35% D) 25%

Answer:   A) 75%

Explanation:

let original radius = r and  new radius = (50/100) r = r/2

original area = $πr2$ and new area = $πr/22$

decrease in area =  $3πr2/4$*$1πr2$ *100 = 75%

Q:

The lengths of the diagonals of a rhombus are 16 cm and 12 cm. Its area is:

 A) 48 cm2 B) 28 cm2 C) 69 cm2 D) 96 cm2

Answer & Explanation Answer: D) 96 cm2

Explanation:
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0 655
Q:

In a triangle, if the measures of two sides are 5 cm and 8 cm, then the third side can be:

 A) 3 cm B) 14 cm C) 2 cm D) 4 cm

Answer & Explanation Answer: D) 4 cm

Explanation:
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0 725
Q:

In the given figure, if

 A) 8 cm B) 9 cm C) 11 cm D) 10 cm

Answer & Explanation Answer: B) 9 cm

Explanation:
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0 408
Q:

In the given figure, $∠APO=35°$ if then which of the following options is correct?

 A) ∠APB = 60° B)  ∠APB = 80° C)  ∠APB = 35° D) ∠APB = 55°

Answer & Explanation Answer: C)  ∠APB = 35°

Explanation:
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0 693
Q:

The area of a semicircle is 77 sq.cm. Calculate its perimeter (in cm)

 A) 72 B) 49 C) 98 D) 36

Answer & Explanation Answer: D) 36

Explanation:
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0 739
Q:

The length of the diagonal and the breadth of a rectangle is 25 cm and 7 cm respectively. Calculate its area (in sq.cm)

 A) 336 B) 168 C) 240 D) 480

Answer & Explanation Answer: B) 168

Explanation:
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0 111
Q:

The area of an equilateral triangle is 18√3 sq.units. Find the value of side (in units) of the triangle.

 A) √2 B) 2√2 C) 3√2 D) 6√2

Answer & Explanation Answer: D) 6√2

Explanation:
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0 93
Q:

An arc length of 16$π$ units subtends an angle of 240 degrees. Find the radius 9in units) of the circle.

 A) 6 B) 12 C) 24 D) 36

Answer & Explanation Answer: B) 12

Explanation:
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0 99