Question

the radius of a cone is 3cm and vertical height is 4cm. find the area of the curved surface, total surface and also the volume of a cone.​

Answer 1

Answer:

r=3 cm and h=4 cm

Let l be the slant height of the cone. Then,

l^2  = r^2 + h^2  

l^2 = 3^2 + 4^2

     = 5 cm

Therefore,

Area of the curved surface = πrl

                                             = 2 x 22/7 x 3 x 5

                                             = 47.14 cm^2    

Answer 2

Answer:

1.Csa of cone =37.71

2.Tsa of cone =66cmsquare

3.volume of cone =24.8688cmcube

Step-by-step explanation:

1. Csa of cone = pie×radius×slant height

=22÷7×3×4=22×12÷7=37.71

2.Tsa of cone= pie ×radius×slant height +radius

=22÷7×3×4+3=22÷7×21=22×3=66

3.Volume of the cone=1÷3×pie×(radius )square×height

=1÷3×22÷7×3×3×2.64=3.14×3×2.64

=24.8688cmcube