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91 A rectangular grassy plot 160 m×45 m has a gravel path 3 m wide all the four sides inside it. Find the cost of gravelling the path at ₹ 5 per sq m:

A
₹ 5970
B
₹ 4970
C
₹ 6490
D
₹ 4970

92 If the area of a semi-circle be 77 sq m, find it's perimeter:

A
36 m
B
42 m
C
48 m
D
54 m

93 The area of a rectangular playground is 300 sq m. If the breadth of the field is 15 m, find the length of the field:

A
20 m
B
11 m
C
25 m
D
10 m

94 A can go round a circular path 8 times in 40 minutes. If the diameter of the circle is increased to 10 times the original diameter, then the time required by A to go round the new path once, travelling at the same speed as before, is

A
20 min
B
25 min
C
50 min
D
100 min

95 The largest triangle is inscribed in a semi-circle of radius 7 cm. Find the area inside the semi-circle which is not occupied by triangle:

A
28 sq cm
B
54 sq cm
C
45 sq cm
D
36 sq cm

96 A circular park has a path of uniform width around it. The difference between outer and inner circumferences of the circular path is 132 m. it's width is

A
20 m
B
21 m
C
22 m
D
28 cm

97 Find the length of a rope by which a cow must be tethered in order that it may be able to graze an area of 9856 m°:

A
64 m
B
32 m
C
56 m
D
28 m

98 A wire which when bent in the form of a square encloses an area of 484 cm°. What will be the enclosed area when the same wire is bent into the form of a circle?

A
462 cm°
B
539 cm°
C
616 cm°
D
693 cm°

99 Four equal-sized circular plates of maximum diameter are cut off from a square paper sheet of area 784 cm°. The circumference of each plate is

A
22 cm
B
44 cm
C
66 cm
D
88 cm

100 The ratio of the length of the parallel sides of a trapezium is 3 : 2. The shortest distance between them is 15 cm. If the area of the trapezium is 450 sq cm, find the sum of the lengths of the parallel sides:

A
15 cm
B
36 cm
C
42 cm
D
60 cm