71. The area of a square with perimeter 48 cm, is :
72. The area of the shaded portion is :
73. If the length of a certain rectangle is decreased by 4 cm and the width is increased by 3 cm, a square with the same area as the original rectangle would result. The perimeter of the original rectangle (in cm) is :
74. The area of a triangle is p sq.cm and its base is x cm. What is the height of the triangle (in cm) ?
75. A triangle of area 9y cm2 has been drawn such that its area is equal to the area of an equilateral triangle of side 6 cm. The value of y would be :
76. If the height of a triangle is decreased by 40% and its base is increased by 40%, what will be the effect on its area ?
77. The diameter of a circle is 3.5 cm. What is the circumference of the circle ?
78. If the perimeter of a square is equal to the radius of a circle whose area is 39424 sq. m. What is the area of the square ?
79. A small ring of negligible thickness and radius 2 cm moves on a bigger rung of radius 10 cm. How many rotations will the small ring take on the bigger ring to make a complete round ?
80. What will be the area of a semi-circle whose perimeter is 36 cm ?
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