Trig Function problem :) (1 Viewer)

[wootwoot1234]

Hey guys,

Could someone please help me with these two questions on Trig Functions (arc length problem).



Thanks in advance!

 

[Sanjeet]

9. The chord forms an isosceles triangle with the centre (since it is the radius), so you can find all angles in the triangle (base angles of isoceles triangle are equal and angle sum of triangle is 180). You can then use the sine rule to find the radius plug that into the formula for arc length.
10. find area of sector for SA of cone, not sure about volume because it is an open cone?