Page 190 - Maths Skills - 8

188 Maths

MIND MAP

Mensuration

Trapezium Cube
1
Area = × altitude × (Sum of Its Parallel Sides)
2

l

Cuboid l
l
� Total surface area (TSA)
[includes all 6-faces]

= 6 l sq. units
2
b
� Lateral surface area (LSA)
h [includes only 4-faces]
l = 4 l sq. units
2
� Total surface area (TSA) � Volume = l = (side) cubic units
3
3
[includes all 6-faces]
= [2 lh + 2 bh + 2 lb] sq. units
� Lateral surface area (LSA)
[includes only 4-faces and
excludes top and bottom faces] Cylinder
= 2 lh + 2 bh = [2 (l + b) h] sq. units
� Volume = lbh cubic units r r

h

+ +

� Curve surface area of cylinder
NOTE = 2πrh sq. unit

� 1 litre = 1000 cm 3 � Lateral surface area of cylinder
2
� 1 millilitre = 1 cm 3 = 2πr + 2πrh = 2πr (r + h) sq. unit
2
� Volume = = πr h cubic units