Side Angle Relationship

Angle Relationships (Review)

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Supplementary Angles (Linear Pair)

Two angles that are side by side and that together make a straight line. These angles always add up to equal 180.

Complementary Angles

Two angles that are side by side and that together form a right angle. These angles always add up to equal 90.

Note: The right angle must be marked with a box.

Vertical Angles

Two angles that are across from each other at the same vertex (or point). These angles are always congruent (meaning equal).

Adjacent Angles

Two angles that are side by side, but they have no special numeric relationship.

Using Angle Relationships

• Identify what type of angles are being shown.

• Determine what the relationship is (add to 180, add to 90, equal, etc.)

• Set up an equation using the relationship.

• Solve for the unknown.

Multiple Choice

What type of angles are shown?

• supplementary

• complementary

• vertical

• adjacent

Multiple Choice

What type of angles are shown?

• supplementary

• complementary

• vertical

• adjacent

Open Ended

What is the missing angle measure?

Open Ended

What is the missing angle measure?

Open Ended

Solve for x.

Open Ended

Solve for x.