![]() ![]() M ∠ AFE = 180°, so ∠ AFE is a straight angle. In Figure 12, ∠ BAC is a straight angle.Įxample 4: Use Figure 13 to identify each named angle as acute, right, obtuse, or straight: (a) ∠ BFD, (b) ∠ AFE, (c) ∠ BFC, (d) ∠ DFA. Some geometry texts refer to an angle with a measure of 180° as a straight angle. In Figure 10, ∠ b is acute.Īn obtuse angle is an angle whose measure is more than 90° but less than 180°. Questions Tips
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