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Mathematics 12 Online
OpenStudy (colcaps):

What is the measurement of the exterior angle of a regular octadecagon?

ganeshie8 (ganeshie8):

octa + decagon = 8 + 10 = 18 ?

OpenStudy (colcaps):

octa is 8 and deca is 10 yes it is

ganeshie8 (ganeshie8):

give a try, use what u knw already sum of exterior angles = 360

OpenStudy (colcaps):

so 360/18=20

ganeshie8 (ganeshie8):

Perfect !

OpenStudy (colcaps):

woot thanks

ganeshie8 (ganeshie8):

:) np

OpenStudy (colcaps):

a regular polygon has an exterior angle measuring 20° how many sides does it have?

OpenStudy (colcaps):

what formula will i use?

ganeshie8 (ganeshie8):

same formula

ganeshie8 (ganeshie8):

sum of exterior angles = 360 20x = 360 x = ?

OpenStudy (colcaps):

so 360/20=18 so that formula is for finding sides right?

ganeshie8 (ganeshie8):

^right ! 360/ext.angle = # sides

OpenStudy (colcaps):

thanks

ganeshie8 (ganeshie8):

np :)

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