Posted by **hi** on Tuesday, September 25, 2007 at 2:31pm.

Im confused can any1 help me on this question ?? or try and put me on the right track?

(a) A circle has radius 2cm (in that circle there is an triangle AOB) and the chord AB has length 3cm. AO is 2cm and BO is 2cm. O is the centre of the circle.

(b) consider a paper disc whose boundary is the circle in part (a). The sector AOB is removed from the paper disc and the remaining paper is bent round to form a shallow cone by joining the edge OB to the edge OA.

(i) Which arc becomes the circle that is at the base of the cone? Find the angle subtended by this arc in the original circle (in radians), and hence find the length of the arc.

(ii) Hence find the radius of the circle that is at the base of the cone.

(iii) Find the perpendicular height of the cone.

(iv)Given that the formula for the volume of a cone is V = 1/3 pie r^2 h

(Where r is the radius of the base and h is the perpendicular

Height),

find the volume of the cone in this question

## Answer this Question

## Related Questions

- can xome1 help me plzz im stuck - HELP PLZZ...A circle has radius 2 cm,(in that ...
- maths - O is the centre of the circle and A and B are points on the ...
- GEOMETRY CIRCLE - 1.An isosceles triangle with each leg measuring 13 cm is ...
- pre calc - each of three circles touches the other 2.circle A has a radius of 8 ...
- Maths - 1. In the xy-coordinate plane, point A is the midpoint of the segment ...
- GEOMETRY CIRCLES PLEASE - 1.An isosceles triangle with each leg measuring 13 cm ...
- Check!!! - okay so the question is: A unit circle center at the origin undergoes...
- circle geometry triangles - how do u construct a circle that is circumscribed of...
- geometry - In the diagram, circle A is tangent to circle C, and segment BE is ...
- GEOMETRY CIRCLES PLEASE - HELP ME PLEASE. 1.An isosceles triangle with each leg...