0 votes
277 views
in Mathematics Form 2 by

The figure below is a cone whose base radius is 3.5cm and slant height 7cm. The net of the cone is a sector of a circle.
figure of a cone

  1. Find the angle subtended at the centre of the sector. 
  2. Draw the net of the solid. 

1 Answer

0 votes
by
  1. Surface area of a cone = πrl
    22/7 × 3.5 × 7
    =77
    Area of a sector =  θ  πr2
                              360
    (θ/360 × 22/7 × 7 × 7 =77)
    θ = 77 × 360
            22 × 7
    =180°

  2. net diagram of a cone
Welcome to EasyElimu Questions and Answers, where you can ask questions and receive answers from other members of the community.

5.5k questions

6.5k answers

8 comments

590 users

...