∠ABC ∠DEF ∠GHI ∠JKL ∠ONM ∠PQR ∠TUS
∠ ∠ ∠ ∠
∆аAngle Sum Thm. ∆аExt. Angle Thm.
∆1: Additional Thoughts: Classify the ∆ by its angles: Where do the 3
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