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The Brainliest Answer!

let the unknown angle x


720-8x=x ⇒ 720=x+8x ⇒720=9x ⇒x=80

therefore the angle is 80 degrees

Proof :complement of 80 degree is10.  10×8=80

1 5 1
Very simple its 8 times
comp.is 90 so 10×8=80
1 5 1
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