41.
The circumferences of two circle are 132 metres and 176 metres respectively. What is the difference between the area of the larger circle and the smaller circle ?

42.
The ratio of the radii of two circles is 1 : 3. Then the ratio of their areas is :

43.
The circumference of a circular ground is 88 metres. A strip of land, 3 metres wide, inside and along the circumference of the ground is to be levelled. What is the budgeted expenditure if the levelling costs Rs. 7 per square metre ?

44.
If the circumference of a circle is 100 units, then what will be the length of the arc described by an angle of 20 degrees ?

45.
If in a triangle, the area is numerically equal to the perimeter, then the radius of the inscribed circle of the triangle is :

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