Angle Addition and Angle Relations

Identify an acute angle.

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Identify a right angle.

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Identify a straight angle.

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Identify an obtuse angle.

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Identify the angle addition postulate.

• AB + BC = AC

• ∠ABD + ∠DBC = ∠ABC

• ∠ABD ≅ ∠DBC

Which symbol represents perpendicular?

• ∞

• ≅

• ⊢

• ⊥

Name the sides of ∠B.

• Ray AB and ray CB

• Ray AB and ray BC

• Ray BA and ray BC

• Ray BA and ray CB

If m∠5 = 42° and m∠1 = 117°, find m∠CDF.

• 21°

• 63°

• 75°

• 159°

In the diagram, ray DG and ray DF are perpendicular. If m∠3 = 73°, find m∠FDE.

• 17°

• 27°

• 77°

• 107°

If m∠MKL = 83°, m∠JKL = 127°, and m∠JKM = (9x -- 10)°,

find the value of x.

• x = 24°

• x = 22°

• x = 6°

• x = 4°