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Mathematics 9 Online
OpenStudy (is3535):

http://prntscr.com/afb3j1

OpenStudy (is3535):

@Photon336

OpenStudy (anonymous):

a triangle has to equal 180

OpenStudy (anonymous):

you have two angles 51 and 90

OpenStudy (anonymous):

whats 51 plus 90?

OpenStudy (anonymous):

when u add them then you subtract that by 180

OpenStudy (anonymous):

and that's your answer

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