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Mathematics 25 Online
OpenStudy (anonymous):

May you help me with this one? @phi

OpenStudy (phi):

they are saying you have regular triangles (means equilateral triangles, which have 60º angles) |dw:1407269191801:dw|

OpenStudy (anonymous):

@phi I'm confused how to work it out, is it 60+60 ?

OpenStudy (phi):

we need a shape that "fills in" the missing 240º a square has a 90º corner. and two squares would be 180º. It would look like this |dw:1407269523067:dw|

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