Question

Please help me with this question, it's my last question in apex and my last chance.

The measure of DE is 108o. What is the measure of 11 years ago

Answer 1

so the angle at centre for this arc is 108 deg

Answer 2

but the angle between a tangent and a radius is 90 deg
therefore angle DEF = 90-(180-108)/2
=54 deg C

Answer 3

so C is the answer

Answer 4

It's correct! Thank you very much. :]

Answer 5

np :)