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Adjacent Angles Rules and Examples – Grade 5 Math

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📄 Adjacent Angles Rules and Examples – Grade 5 Math

Learn the defining features of adjacent angles with examples that explain common vertices, shared sides, and non-overlapping interiors.

Adjacent Angles Rules: Check Your Understanding

Check the defining features of adjacent angles with these quick questions and examples.

Question 1: Two angles share point O and ray OB. Their interiors do not overlap. What is the shared point called?

Reveal answer and explanation

Answer: The common vertex.
Explanation: The vertex is where the angle sides meet; O is the common vertex.

Question 2: Two angles share a vertex but have no common side. Are they adjacent?

Reveal answer and explanation

Answer: No.
Explanation: Adjacent angles share a common vertex and a common side.

Question 3: Can adjacent angles have different measures?

Reveal answer and explanation

Answer: Yes.
Explanation: Adjacent angles do not need to be equal; for example, 30° and 50° can be adjacent.

Question 4: What must be true about the interiors of adjacent angles?

Reveal answer and explanation

Answer: They do not overlap.
Explanation: Non-overlapping interiors are a defining feature of adjacent angles.

Question 5: Two adjacent angles measure 25° and 65°. Must they form a straight angle?

Reveal answer and explanation

Answer: No.
Explanation: Their total is 90°, not 180°. Adjacent angles do not always form a straight angle.