WILL MEDAL AND FAN!!! What is the measure of ∠R?

A.
145°

B.
125°

C.
55°

D.
35°
https://static.k12.com/calms_media/media/1418000_1418500/1418208/1/06da8df53a152e7039b7bc62778897b38c236f5c/MATH_YELLOW_130913_250802.jpg

Question

WILL MEDAL AND FAN!!! What is the measure of ∠R?

A.
145°
 
 B.
125°
 
 C.
55°
 
 D.
35°
https://static.k12.com/calms_media/media/1418000_1418500/1418208/1/06da8df53a152e7039b7bc62778897b38c236f5c/MATH_YELLOW_130913_250802.jpg

pooja195 · Answer

How many degrees in a triangle? Do you know?

sand-lock53 · Answer

in order to find the answer, you have to subtract 55 from 180. after that, since there is a right angle, you have to subtract that too.

anonymous · Answer

180 degrees in a triangle..

pooja195 · Answer

Good :) 
And do you know what that box in the corner means? 
|dw:1456185932045:dw|

anonymous · Answer

90 degrees?

pooja195 · Answer

perfect now do what sand said
first add up the givens
90+55= ?

anonymous · Answer

145

pooja195 · Answer

good now subtract:
we know that there are 180 degrees in a triangle soo
180-145=?

anonymous · Answer

35

pooja195 · Answer

Good and that would be our answer :-)

anonymous · Answer

:D you're the best ty! Are u a teacher?

pooja195 · Answer

hahaha no xD but i just learned this so i can teach it well :P 
but ty <3
and yw :*

anonymous · Answer

:)