Project work
maths Prepared By : Sunpreet Batra
Class IX, Roll No. 28

Slide 2:

Side 2 Bottom Back Top Side 1 Front Length (L) Breadth (B) Height (H) Cuboid

The net :

The net L L L L B H H H H L B B B B B H H

Slide 4:

Front face
20 cm2

Slide 5:

60 cm3 Volume = 4 cm x 5 cm x 3 cm = 60 cm3 20 cm3 40 cm3 Volume of a Cuboid

Slide 6:

Volume = 4 mm x 3 mm x 3 mm = 36 mm3 Volume = 2 cm x 7 cm x 6 cm = 84 cm3 36 mm3 36 mm3 84 cm3 84 cm3 Volume = 9 ft x 4 ft x 6 ft = 216 ft3 216 ft3 216 ft3 Volume l x w x h ? yards3

Slide 7:

H B L H B H L L L H B L H B H L L Total surface Area = L x H + B x H + L x H + B x H + L x B + L x B
= 2 LxB + 2BxH + 2LxH
= 2 ( LB + BH + LH ) Total surface Area

Slide 8:

Cube :

Cube Volume = Base area x height
= L x L x L
= L3 L L L Total surface area = 2LxL + 2LxL + 2LxL
= 6L2

Slide 10:

2(LxB + BxH + LxH) LxBxH Cuboid 6L2 L3 Cube Sample net Total surface area Volume Figure Name

Surface area of cylinders :

Surface area of cylinders Lateral area is the surface area minus the bases
Surface area includes both bases L.A. = 2 π r h
S.A. = L.A.+2π r2 = 2 π r h + 2π r2

Volume of cylinders :

Volume of cylinders Volume of right cylinder
Volume = base x height
= r2 h

What is a cone? :

What is a cone? …... …...

Volume of a cone :

Volume of a cone

Slide 15:

The Cone A Cone is a three dimensional solid with a circular base and a curved surface that gradually narrows to a vertex. Volume of a Cone
= + + =

Slide 16:

Find the area of a cone with a radius r=3 m and height h=4 m. Use the Pythagorean Theorem to find l
l 2 = r2 + h2
l 2= (3)2 + (4)2
l 2= 25
l = 5 Surface Area of a Cone Surface Area of a Cone
= pr2 + prl
= 3.14(3)2 + 3.14(3)(5)
= 75.36 m2 r = the radius h = the height l = the slant height

How to calculate the curved surface area ? :

How to calculate the curved surface area ? Cut here

Slide 18:

Curved surface area = πr l Curved surface area Curved surface area = Area of the sector Curved surface area = 1/2 ( l ) ( 2π r )
= π r l After cutting the cone,

Sphere :

Sphere r To picture the surface area of a sphere imagine peeling an orange and flattening
the peel on a table. The area covered would be the surface area of that sphere.
S = 4r2 Note this is the area of 4 circles with radius r. The formula for the volume of a sphere is
V = 4/3r3

Surface area & volume of spheres :

Surface area & volume of spheres Surface Area = 4 π r 2
Volume =

Find the Volume of a Sphere :

Find the Volume of a Sphere Find the volume of the hemisphere. Round your answer to the nearest whole number.
b. A hemisphere has half the volumeof a sphere. a 5 in.

Slide 22:

Thanks Reference : - NCERT Text Book, Class 9

You do not have the permission to view this presentation. In order to view it, please
contact the author of the presentation.

Send to Blogs and Networks

Processing ....

Premium member

Use HTTPs

HTTPS (Hypertext Transfer Protocol Secure) is a protocol used by Web servers to transfer and display Web content securely. Most web browsers block content or generate a “mixed content” warning when users access web pages via HTTPS that contain embedded content loaded via HTTP. To prevent users from facing this, Use HTTPS option.

By: lăkşħ-mèsh (42 month(s) ago)

plzzz allow me to download your ppt