2. Study the diagram on the right. (i) Which angle is vertically opposite to ∠A? (ii) Which angle corresponds to ∠D? (iii) Which angle is alternate to ∠C? (iv) Which angle corresponds to ∠G? (v) Which angle is alternate to ∠G? (vi) Which angle corresponds to ∠F? (vii) Which angle is alternate to ∠D? (viii) Name a pair of angles that add up to 180°.
A C D
B
E G H
F
3. Write down whether each of the pairs of angles (A and B) in each of the following diagrams are vertically opposite, alternate or corresponding angles.
(i) A B (ii)
A B
A (iii) B B (iv) A
4. In each of the diagrams below, find the measure of angles X and Y and give the theorem and/or axiom used in each case (diagrams not to scale).
(i) Y 122° X X
5. In each of the diagrams below, find the measure of the unknown angles (mark with letters A to U) and give the theorem and/or axiom used in each case (diagrams not to scale).
(i)
A B C D
E F 114° G
(ii) L M
H I
J N 63° K S (iii) O U 133° P
R T
Q (ii) Y 47° 131° X Y (iii)
Section A Introducing concepts and building skills