Question

The triangles in the diagram are congruent. If mF = 40°, mA = 80°, and mG = 60°, what is mB?

Answer 1

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Answer 2

The triangles have a SAS theorem so basically if angle mA equals 80 the one that is equal or congruent to it on the other triangle is mE so mE equals 80. Next is mG, mG is 60 and its congruent to mC so mC equals 60. Finally there's mF the only angle or measure left is mB so mB is equal to 40. Then add it all up and make sure it equals 180. But mB equals 40