The diagonals of two squares are in the ratio 5 : 2. The ratio of their areas is:

• 5 : 6

• 25 : 4

• 5 : 4

• 125 : 8

The lengths of diagonals of a rhombus are 24 cm and 10 cm, the perimeter of the rhombus (in cm) is:

• 52

• 56

• 68

• 72

If x is the area, y is the circumference and z is the diameter of circle then the value of  is

• 4 : 1

• 1 : 4

• 1 : 2

• 2 : 1

84.

The four sides of a quadrilateral are in the  ratio of 2 : 3 : 4 : 5 and its perimeter is 280 m. The length of the longest side is:

• 100 m

• 150 m

• 175 m

• 180 m

Two adjacent sides of a parallelogram are 21 cm and 20 cm. The diagonal joining the end points of these two sides is 29 cm. The area of the parallelogram (in sq cm) is

• 240

• 120

• 210

• 420

In an equilateral triangle of side 24 cm, a circle is inscribed touching its sides. The area of the remaining portion of the triangle is approximately equal to:

• 36.6 cm²

• 54.2 cm²

• 72.8 cm²

• 98.5 cm²

The lengths of the diagonal of a rhombus are 8cm and 6 cm. The area of rhombus is:

• 96 cm²

• 60 cm²

• 48 cm²

• 24 cm²

If the circumference of a circle is decreased by 50%, then the percentage of decrease in its area is

• 25

• 50

• 60

• 75

An equilateral triangle of side 6 cm has its corners cut off to form a regular hexagon. Area (in cm²) of this regular hexagon will be

• 3√3

• 3√6

• 6√3

• 5√3 / 2

A bicycle wheel makes 5000 revolutions in moving 11 km. Then, the radius of the wheel (in cm) is 

• 70

• 35

• 17.5

• 140