Understanding Angles on a Straight Line

If angle DBC is 30° on a straight line AC, what is the measure of angle ABD?

• 90°

• 180°

• 150°

• 120°

Given that angle SQR is 150° on a straight line PR, what is the measure of angle PQS?

• 75°

• 65°

• 30°

• 45°

If angle S is 55° and angle R is 25° on a straight line, what is the measure of angle T?

• 120°

• 110°

• 90°

• 100°

What is the sum of angles on a straight line?

• 360°

• 90°

• 180°

• 270°

If angle S is 55° and angle R is 25°, what is the sum of angles S and R?

• 110°

• 100°

• 90°

• 80°