help please

[xc630]

Hi I have no idea where to go with this problem:

Triangle DEF is inscribed ina circle of radius 3. If angle D = 120 and angle E= 15 find the lengths of e, d, and f. It says to find the measures of arc DE and arc DF as a hint but i dont know how to

Thanks for any help

 

[Gene]

The central angle subtending arc DE = 2*angle DFE. If you have trig is your arsenal that should be enough of a hint.