Area
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121 The ratio of the areas of the circumcircle and the incircle of a square is
122 A man riding a bicycle, completes one lap of a circular field along it's circumference at the speed of 14.4 km/h in 1 min 28 s. What is the area of the field?
123 Find the area of the largest triangle that can be inscribed in a semi-circle of radius 9 cm:
124 The area of a rectangle is equal to the area of a circle with circumference equal to 39.6 m. What is the length of the rectangle if it's breadth is 4.5 m?
125 The difference between the length and breadth of a rectangle is 23 m. If it's perimeter is 206 m, then it's area is
126 The diagonals of two squares are in the ratio of 3 : 2. Find the ratio of their areas:
127 If a wire is bent into the shape of a square, then the area of the square is 81 cm°. When the wire is bent into a semi-circular shape, the area of the semi-circle will be
128 The perimeter of a rhombus is 146 cm and one of it's diagonal is 55 cm. Find the other diagonal and the area of the rhombus: