Find the size of angle
x
, and give a reason.
Your answer
x =
°
Because… (pick the reason)
— choose a reason —
Vertically opposite angles are equal
Angles on a straight line add to 180°
Angles at a point add to 360°
Corresponding angles, parallel lines (equal)
Alternate angles, parallel lines (equal)
Co-interior angles, parallel lines (add to 180°)
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Set out the answer the way an examiner wants it: the
number
, then the
reason
. Both have to be right to earn the mark.