Geometry

76. To find the diameter of a circle where circumference is 30 inches:

• ক. multiply 30 by π
• খ. divide 30 by 2π
• গ. divide 15 by 2π
• ঘ. divide 30 by π

77. One angle of triangle is four times the second angle and the third angle is 6 degrees more than the second angle. The second angle in degree is--

• ক. 35
• খ. 40
• গ. 30
• ঘ. 45

78. The radious of the earth is 4 times that of the moon. How many times the surface area of the moon is to that of the earth?

• ক. 64
• খ. 6
• গ. 36
• ঘ. 32

79. If the ratio of the radii of the two circles is 3 : 2, than the ratio of the areas of the two circles is:

• ক. 4 : 9
• খ. 9 : 4
• গ. 2 : 3
• ঘ. 3 : 4

80. If the radious of a cylinder is tripled while its height is halved, its volume will be:

• ক. Halved
• খ. Unchanged
• গ. Doubled
• ঘ. Increased by 50%

81. If each angle of a regular polygon is 162°, how many sides does it have?

• ক. 12
• খ. 10
• গ. 8
• ঘ. 16

82. If both length and width of a rectangular plot for a garden are increased by 20%, What would be the percent increased in the area of the plot?

• ক. 20%
• খ. 25%
• গ. 35%
• ঘ. 44%

83. Who is the father of Geometry?

• ক. Aristotle
• খ. Euclid
• গ. Pythagoras
• ঘ. Kepler

84. If the voluem of a cube is 27 cubic meters, find the surface area of the cube?

• ক. 9 square meters
• খ. 18 square meters
• গ. 54 square meters
• ঘ. 3 square meters

85. What is the area of the equilateral triangle if the base BC = 6?

• ক. 9√3
• খ. 18√3
• গ. 26√3
• ঘ. 30√3

86. In a garden, there are 10 rows and 12 columns of mango trees. The distance between two trees is 2 meters and a distance of one meter is left from all sides of the boundary of the garden. What is the length of the garden?

• ক. 20 m
• খ. 22 m
• গ. 24 m
• ঘ. 26 m

87. The area of a rectangle is 460 square meters. If the length is 15% more than the breadth, what is the breadth of the rectangular field?

• ক. 15 meters
• খ. 26 meters
• গ. 34.5 meters
• ঘ. None of these

88. The angle between the minute hand and the hour hand of the clock when the time is 4.20 is:

• ক. 0°
• খ. 10°
• গ. 5°
• ঘ. 20°

89. How many times in a day, the hands of a clock are straight?

• ক. 22
• খ. 24
• গ. 44
• ঘ. 48

90. If the length of rectangle A is one-half the length of rectangle B, and the width of rectangle A is one-half the width of rectangle B, what is the ratio of the area of rectangle A to the area of rectangle B?

• ক. 1/4
• খ. 1/2
• গ. 1/1
• ঘ. 2/1