71.
The length of one side of a rhombus is 6.5 cm and its altitude is 10 cm. If the length of its diagonal be 26 cm, the length of the other diagonal will be:

72.
A rectangular lawn whose length is twice of its breadth is extended by having four semicircular portions on its sides. What is the total cost (in Rs.) of levelling the entire lawn at the rate of Rs. 100 per square metre, it the smaller side of the rectangular lawn is 12 m? (Take π = 3.14)

73.
ABCD is a trapezium with AD and BC parallel sides. The ratio of the area of ABCD to that of ΔAED is
Mensuration 2D mcq question image

74.
a and b are two sides adjacent to the right angle of a right angled triangle and p is the perpendicular drawn to the hypotenuse from the opposite vertex. Then p2 is equal to

75.
A took 15 sec to cross a rectangular field diagonally walking at the rate of speed 52 m/min and B took the same time to cross the same field along its sides walking at the rate speed 68 m/min. The area of the field is:

76.
The area of the shaded region in the figure given below is
Mensuration 2D mcq question image

77.
The width of the path around a square field is 4.5 m and its area is 105.75 m2. Find the cost of fencing the path at the rate of Rs. 100 per metre.

78.
In the given figure, ABCDEF is a regular hexagon whose side is 6 cm. APF, QAB, DCR and DES are equilateral triangles. What is the area (in cm2) of the shaded region?
Mensuration 2D mcq question image

80.
Two regular polygons are such that the ratio between their number of sides is 1 : 2 and the ratio of measures of their interior angles is 3 : 4. Then the number of sides of each polygon are