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Mathematics 10 Online
OpenStudy (anonymous):

Geometry help D:

OpenStudy (agent0smith):

|dw:1367201278869:dw| The 40 and 40 are vertical angles which are equal. The 85 forms a supplementary angle with (180-85) (supplementary angles add up to 180 because they form a straight line) Notice the two a's are vertical angles too.

OpenStudy (anonymous):

so a is 45?

OpenStudy (agent0smith):

Looks that way :)

OpenStudy (anonymous):

ok, thanks

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