Question

find curved surface area and total surface area of following each right angled circular cones
i)height =2cm,radius=3.5cm
ii)height=3.5cm,diameter=10cm

Answer 1

Answer:

Step-by-step explanation:

1) height  = 2cm

= radius = 3.5cm

slant height = $\sqrt{r^{2}+h^{2}  }$

                    =  $\sqrt{2^{2}+3.5^{2}  }$

                    = 4.03 cm

CSA of cone = πrl

                     = 22/7*2*4.03

                     = 25.32 cm²

TSA of cone = πr(r+l)

                     = 22/7*2*6.03

                      = 37.88 cm²

2) radius = 5cm

= height = 3.5cm

=CSA of cone = πrl

                        = 22/7*5*3.5

                         = 55 cm²

TSA of cone = πr(l+r)

                     = 22/7*5*8.5

                      = 133.57 cm²