In the figure below, what is the sum, in terms of n, of the degree measure of the four angles marked with question marks (?)

a) n

b)2n

c) 180-n

d) 360-n

e)360-2n

- - - - -615

Please show steps so I can understand. Thanks in advance!!!

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- September 25th 2008, 10:27 PMfabxx[SOLVED] Find the degree of the angles
In the figure below, what is the sum, in terms of n, of the degree measure of the four angles marked with question marks (?)

a) n

b)2n

c) 180-n

d) 360-n

e)360-2n

- - - - -615

Please show steps so I can understand. Thanks in advance!!! - September 25th 2008, 10:53 PMMoo
Hello,

Note that

But we know that

Hence

Similarly, we have

Thus the sum of the four angles OAD, ODA, OBC and OCB is 2n.