Area
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81 If area of a square is 44 sq cm, find the area of the circle formed by the same perimeter:
82 The inner circumference of a circular race track 7 m wide is 440 m. Find the radius of the outer circle:
83 Find the area of a square inscribed in a circle of radius 5 cm:
84 A farmer wishes to start a 100 m° rectangular vegetable garden. Since he has only 30 m barbed wire, he fences three sides of the garden setting his house compound wall act as the fourth side fencing. The dimension of the garden is
85 Two isosceles triangles have equal vertical angles and their corresponding sides are in the ratio of 3 : 7. What is the ratio of their areas?
86 The area of the incircle of an equilateral triangle of side 42 cm is
87 Find the diameter of a wheel that makes 113 revolutions to go 2 km 26 decemetres:
88 If the radius of a circle is increased by 6%, find the percentage increase in it's area: