2. RECTANGLE
Where π₯ is the lenght, π the breadth, and π‘ is height
ο· Normal Rectangle
π΄π πΈπ΄ = π₯ × π
ππΈπ πΌππΈππΈπ = 2(π₯ + π)
ο· 4 Walls of a Room
π΄π πΈπ΄ = 2(π₯ + π) × π‘
3. TRIANGLE
ο· Normal Triangle
Where π is the base and π‘ the height ,
π, π, π are the sides of the triangle,
π¬ is the semi − perimeter of the triangle.
1
π΄π πΈπ΄ = ππ‘ =
2
RECTANGULAR BOX
Where π, π, π are the three sides of the Box.
π΄πππ = πππ + πππ + πππ
ππππ’ππ = πππ
15.
CONE
Where π« is the radius (of the top), π‘ is the height
Where π is the radius base of the frustum
Where π₯ is slant height of the frustum or cone .
Right Circular Cone
π΄πππ = ππ2 + πππ
πΆπ’ππ£ππ ππ’ππππ π΄πππ = πππ = ππ( π‘2 + π« 2 )
π΄πππ ππ π‘ππ πππ π = ππ2
π ππππ‘ ππππππ‘ ππ ππππ (π₯) = π‘2 + π« 2
1
CUBE
Where π is the side of the cube
π΄πππ = 6π2
ππππ’ππ = π3
17.
CUBOID
Where π is the side, π is the base, and π‘ is the height
π΄πππ = 2(ππ + ππ + ππ)
ππππ’ππ = π × π × π
π·πππππππ =
PRISM
Where π is base, π‘ is the height and π slant height
Where π is the perimeter of the base
πΏππ‘ππππ π΄πππ = π × π
πππ‘ππ π΄πππ = 2π + πΏππ‘ππππ π΄πππ