Area

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61 The sides of a triangle are 6 cm, 11 cm and 15 cm. The radius of it's incircle is

A
3RT2 cm
B
5RT2/4 cm
C
6RT$$\frac{2}{3}$$
D
6RT3 cm

62 Find the area of a rhombus one of whose diagonals measures 10 cm and the other 12 cm:

A
120 cm×
B
60 cm×
C
50 cm×
D
40 cm×

63 If an equilateral triangle of area A and a square of area Y have the same perimeter, then X is

A
equal to Y
B
greater then F
C
less than Y
D
less than or equal to Y

64 A rectangular park 60 m long and 40 m wide has two concrete crossroads running in the middle of the park, and rest of the park has been used as a lawn. If the area of the lawn is 2109 m°, then what is the width of the road?

A
2.91 m
B
3 m
C
5.82 m
D
None of these

65 The length of a rectangular plot is 60 % more than it's breadth. If the difference between the length and the breadth of that rectangle is 24 cm, what is the area of that rectangle?

A
2400 cm°
B
2480 cm°
C
2550 cm°
D
2560 cm°

66 If in a triangle, the area is numerically equal to the perimeter, then the radius of the inscribed circle of the triangle is

A
1
B
1.5
C
2
D
3

67 The radius of a wheel is 0.25 m. The number of revolutions it will make to travel a distance of 11 km will be

A
2800
B
4000
C
5500
D
7000

68 Three sides of a triangular field are of length 15 m, 20 m and 25 m long, respectively. Find the cost of sowing seeds in the field at the rate of X 5 per sqm:

A
750
B
150
C
300
D
600

69 If the ratio of areas of two circles is 4 : 9, then the ratio of their circumferences will be

A
2 : 3
B
3 : 2
C
4 : 9
D
9 : 4

70 A rectangular paper, when folded into two congruent parts, had a perimeter of 34 cm for each part folded along one set of sides and the same is 38 cm when folded along the other set of sides. What is the area of the paper?

A
140 cm°
B
240 cm°
C
560 cm°
D
None of these