Angle Properties

• Identify: Supplementary, vertically opposite, corresponding and alternate angles.

• Know that angles of a triangle add up to 180°

• Know that the exterior angle of triangle is equal to the sum of the two interior opposite angles.

• Know that angles of a quadrilateral add up to 360°

Supplementary Angles (add to 180°)

 

Vertically Opposite Angles..... are equal

 

Corresponding Angles (look for an 'F' shape)...... are equal

 

Alternate Angles (look for a 'Z' shape)....are equal

Angles of a triangle add up to 180°

A + B + C = 180°

Exterior angle of triangle is equal to the sum of the two interior opposite angles.

C = A + B

Angles of a quadrilateral add up to 360°

80° + 100° + 90° + 90° = 360°

Homework:

P153  Ex 16.4C  Q3-6 

P156  Ex 17.1B  Q4-8

P158  Ex 17.2     Q3, 5, 6

P160  Ex 17.3A  Q3, 4

P160  Ex 17.3B   Q1, 4