Answer :

You have to read the protractor to determine the measure of each angle.

For all the angles B is the vectress.

∠ABF =90º

∠ABE= 40º

∠ABD= 20º

∠EBF= ∠ABF-∠ABE= 90º-40º= 50º

∠DBE= ∠ABE-ABD= 40º-20º=20º

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