818
Q:

If each side of a square is increased by 25%, find the percentage change in its area?

A) 65.25 B) 56.25
C) 65 D) 56

Answer:   B) 56.25



Explanation:

let each side of the square be a , then area = a2 

As given that The side is increased by 25%, then 

New side = 125a/100 = 5a/4 

 

New area = 5a42  

 

Increased area= 25a216-a2 

 

Increase %=9a2/16a2*100  % = 56.25%

Q:

The length of the diagonal and the breadth of a rectangle is 13 cm and 5 cm respectively. Calculate its area (in cm²).

 

A) 60 B) 120
C) 37 D) 74
 
Answer & Explanation Answer: A) 60

Explanation:
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0 52
Q:

Find the area (in sq units) enclosed by y = 0, x+6=0 and 2x-3y=6.

A) 9 B) 16
C) 20 D) 27
 
Answer & Explanation Answer: D) 27

Explanation:
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0 41
Q:

In ΔXYZ measure of angle Y is 90°. If cosecX = 17/15, and XY = 4cm, then what is the length (in cm) of side YZ?

A) 7.5 B) 8.5
C) 5 D) 6
 
Answer & Explanation Answer: A) 7.5

Explanation:
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0 49
Q:

Find the area (in cm²) of a semi-circle of radius 35 cm.

A) 3850 B) 960
C) 1920 D) 1925
 
Answer & Explanation Answer: D) 1925

Explanation:
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0 38
Q:

The lengths of the two diagonals of a rhombus are 8 cm and 15 cm respectively. Find its area (in cm²).

A) 30 B) 120
C) 90 D) 60
 
Answer & Explanation Answer: D) 60

Explanation:
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0 32
Q:

Two equal circles intersect each other at point A and B, whose centers are O and O’. OO’ = 24 mm and AB = 10 mm, then find the area (in sq. mm) of the circle.

 

A) 530.66 B) 520.66
C) 510.33 D) 500.33
 
Answer & Explanation Answer: A) 530.66

Explanation:
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0 30
Q:

The length of the diagonal of a square is 12 cm. Find its area (in cm2).

A) 36 B) 72
C) 144 D) 48
 
Answer & Explanation Answer: B) 72

Explanation:
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0 73
Q:

The length and breadth of a rectangle are 21 cm and 20 cm respectively. Find its area (in cm2).

 

A) 420 B) 840
C) 80 D) 160
 
Answer & Explanation Answer: A) 420

Explanation:
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0 212