Mensuration Questions and Answers updated daily – Aptitude
Mensuration Questions










Volume of the cylinder = πr2h = π * 6 * 6 * 21
Given that, diameter of bullet = 1.5 cm
--> radius of bullet = Diameter/2 = 1.5/2 = 0.75 cm = 3/4 cm
Volume of 1 bullet = Volume of Sphere = (4/3)πr3
= (4/3) * π * (3/4) * (3/4) * (3/4)
Here, Number of Bullets = Volume of the cylinder/Volume of 1 bullet
= [π * 6 * 6 * 21]/ [(4/3) * π * (3/4) * (3/4) * (3/4)]
= [6 * 6 * 21 * 3 * 4 * 4 * 4]/ [4 * 3 * 3 * 3]
= 1344











In ⊿ABC
AC = √((AB)² + (BC)²)
AC = √(16² + 12² )
AC = √400
AC = 20 cm
Therefore, diameter of circumcircle, AC = 20 cm
Radius of circumcircle, r = 10 cm
WKT, Area of Circumcircle = πr²
Area of circumcircle = π10²
= 100π cm²










Cylindrical pencil of diameter = 1.2 cm
Height of the pencil, h = 1.4 cm
Radius of Cylindrical pencil, r = 1.2/2 = 0.6 cm
WKT,
Volume of cylinder = πr² h
Volume of cone = (1/3)πr² h
Volume of material removed = πr² h - (1/3)πr² h
= (2/3)πr² h
= (2/3)(22/7)(0.6 x 0.6 x 1.4)
= 1.056 cm3










Perimeter of an equilateral triangle = √3 Area of that triangle.
WKT, Perimeter of an equilateral triangle = 3a
Area of an equilateral triangle = (√3/4)a²
Therefore,
3a = √3 (√3/4)a²
a = 4 unit.










On keeping cans each having diameter of 14 cm, erect in the rectangular box, the height occupied by the cans is 30 cm. So, some cans can be placed horizontally on the base.

Number of cans that can be placed erect in a row = Length of the box/Diameter of can
= 76/14
= 5.43
= 5 cans (Remaining space will be vacant)
Number of such rows that can be placed = Breadth of the box/Diameter of can
= 46/14
= 3.3
= 3 rows
Hence, Number of cans placed in an erect position = 5 cans * 3 rows
= 15 cans
So far, only 30 cm of the height of the box has been filled with cans. Given, Total height of box = 45cm
Remaining Height of the box = 45 - 30 = 15 cm
which is greater than Diameter of the can (14 cm)
So, in remaining 15 cm of height of the box, we can fill some cans horizontally on the base.
Number of cans that can be placed horizontally in a row = Length of the box/Height of can
= 76/30
= 2.5
= 2 cans (Remaining space will be vacant)
Number of such rows that can be placed = Breadth of the box/Diameter of can
= 46/14
= 3.3
= 3 rows
Hence, Number of cans placed horizontally = 2 cans * 3 rows
= 6 cans
Therefore, Maximum number of cans that can fit in the box = 15 + 6 = 21 cans










radius (r) = diameter/2 = 49/2 dm
--> converting into cm
radius = (49/2) x 10 cm
---> r = 245 cm
Height h = 36 dm
--> converting into cm
h = 36 x 10 cm
--> h = 360 cm
Volume of Cylinder = π r2h
= (22/7) * 245 * 245 * 360
= 22 * 35 * 245 * 360 cm3
Volume of tin = (22 * 18 * 49) cm3
Number of tins to be filled with kerosene from the drum= (Volume of Cylinder/Volume of tin)
= (22 * 35 * 245 * 360) / (22 * 18 * 49)
= 3500










W.K.T:- Perimeter of a square = 4 * side
Perimeter of a rectangle = 2(length + breadth)
Given Rectangle of length = 8 cm and breadth = 7 cm
Perimeter of a rectangle = 2(8 + 7)
= 2 * 15
= 30 cm
So, Perimeter of a square = 4 * side = 2 * perimeter of a rectangle
--> 4 * side = 2 * 30
--> side of the square = 15 cm
Given, Diameter of semicircle (D) = side of the square = 15 cm
So, Circumference/perimeter of the semicircle = πR + 2R = (πD/2) + D
= (3.14 * 15/2) + 15
= 3.14 * 7.5 + 15
= 23.55 + 15
= 38.55 cm










Width of the hall = 8 meters
If 0.5 meters of space is left around the room, then
Length of the hall = 10 - 0.5 - 0.5 = 9 meters
Width of the hall = 8 - 0.5 - 0.5 = 7 meters
Required Area of the hall for carpeting = Length * Width
= 9 * 7
= 63 sq.meter
Required Length of carpet = 63/0.25 = 252 meter
Required cost of carpeting the hall = Length of carpet * cost of carpet per meter
= 252 * 20
= Rs. 5,040










Let, the radius of cylinder = r cm
height = 3r cm
Volume of cylinder = π * r2 * h
--> 25872 = (22/7) * r2 * 3r
---> 25872 = (66/7) * r3
---> 25872 * (7/66) = r3
---> 392 * 7 = r3
---> 2744 = r3
---> ∛2744 = r
---> r = 14
Area of the base of cylinder = Area of circle = π * r2
= (22/7) * 14 * 14
= 44 * 14
= 616 cm square.










Circumference of a circle (C) = π D
= π 42
= (22/7) x 42
= 22 x 6
= 132 cm
Let the length of the rectangle (l) = 6x
and breadth (b) = 5x cm
Perimeter of rectangle = 2 * (l + b)
= 2 * (6x + 5x)
= 2(11x)
= 22x
Perimeter of rectangle = Circumference of a circle
---> 22x = 132
---> x = 6
The length of the rectangle (l) = 6x = 6 * 6 = 36 cm
and breadth (b) = 5x = 5 * 6 = 30 cm
Area of rectangle = l x b
= 36 * 30
= 1080 cm2










7 meter wide road is surrounding a circular park, having circumference of 176 meters.
Formula: Circumference of circle = 2πr
----> 2πr = 176
----> 2 x (22/7) x r = 176
----> r = (176 x 7) / (2 x 22)
----> r = 28 meter
Therefore, radius of circular park = 28 meter
Area of circular park = πr2
= π (28)2
Area of the road = π(radius of circular park radius of road)2 - Area of circular park
= π (28 + 7)2 - π (28)2
= π {352 - (28)2}
Since, a2 - b2 = (a + b) (a - b)
= π {35 + 28} {35 - 28}
= π x 63 x 7
= (22/7) x 63 x 7
= 22 x 63
= 1386 m2
Thus, Area of the road = 1386 m2










volume = a³
Let aâ‚ and aâ‚‚ are the sides of two cubes.
a₳/aâ‚‚³ = 27/64 = (3/4)³
aâ‚ : aâ‚‚ = 3 : 4
The total surface area = 6a²
Ratio of their total surface area = 6a₲/6aâ‚‚²
(aâ‚/aâ‚‚)² = (3/4)² = 9 : 16
Therefore, the ratio of their total surface area = 9 : 16










Area of four walls = 2h*(l + b)
Area of base = lb
Area of wet surface = Area of four walls + Area of base
= 2h*(l + b) + lb
=2*1.25(6+4) + (6*4)
=25 + 24 = 49 m²
Therefore, The total area of the wet surface = 49 m²










Given, Perimeter of the semi-circle = 72 cm
WKT, Perimeter of the semi-circle = πr + 2r
r[(22/7) + 2] = 72
r * [(22 + 14)/7] = 72
r * (36/7) = 72
r = (72*7)/36
r = 14 cm
Therefore, area of semi circle = (πr2)/2
= (22/7)*(14*14)/2
Area of sem-circle = 308 cm2.










Side of the square, a2 = 121
a = √121 = 11 cm
Length of the wire = 4*a = 4*11 = 44 cm
Circumference of the circle = Length of the wire
2πr = 44
2*(22/7)*r = 44
r = (44*7)/(2*22)
r = 7 cm
Therefore, area of circle = πr2
= (22/7)*(7)2
Area of circle = 154 cm2.











Given, a wooden box 'A' with dimensions = 8m * 7m * 6m
= 800cm *700cm * 600cm
Also given, a rectangular box 'B' with dimensions = 8cm * 7cm * 6cm
The maximum number of type B rectangular boxes that can be carried in 1 wooden box of type A is
= Volume of box A/Volume of box B
= (800*700*600)/(8*7*6)
= 10,00,000.
Number of type B rectangular boxes = 10,00,000.










WKT, Volume of cube = a3
Volume of cube 1, V1 = a13
Volume of cube 2, V2 = a23
V1/V2 = a13/a23 = 8/27
a1/ a2= 2/3
a1 : a2 = 2 : 3
Surface area of cube 1, S1 = 6a12
Surface area of cube 2, S2 = 6a22
S1/S2 = 6a12/6a22
= 22/32
= 4 /9
Therefore, required ratio = 4:9.











Here, r - inradius of incircle.
Given, perimeter of triangle = 15 cm
Therefore, semi-perimeter (S) of triangle = 15/2 cm
Radius of incircle = 3 cm
Inradius of triangle, r = Area of triangle/Semi-perimeter of triangle
3 = Area of triangle/(15/2)
Area of triangle = 3*(15/2) = 45/2 cm²
Given that, volume of the prism = 270 cm³
Volume of the prism = Base*Height
270 = (45/2)*h
h = (270*2)/45
h = 12 cm










Therefore, the area of ground = 1000/0.25 = 4000 m²
Breadth = 50 m
Length of rectangle = Area/Breadth
Length = 4000/50 = 80 m
When the length of the ground is increased by 20m,
New length = 80 + 20 = 100m
New area of ground = 100 * 50 = 5000 m²
So, Expenditure of making the ground at same rate = 5000*0.25
= Rs. 1250










Perimeter of rectangle = 2(16x + 9x) = 100
25x = 100
x = 2
Area of rectangle = 32*18 = 576 m2
Given that, Area of rectangle = Area of square
Area of square, a2 = 576 m2
Side of the square, a = 576 = 25m
Perimeter of the square = 4a = 4*24 = 96m.