Question P5–P6 Angle chasing
Today’s problem — free all day, every step. Every day has one.
Two equal angles sit on a straight line together with a third angle of 62 degrees. Find the size of each equal angle.
One angle gives you the next, until you reach the angle asked for.
In this one. Angles on a straight line add up to 180°, so take away the angle you know and let the two equal angles share what is left — half each.
A figure has several angles marked with only one or two values given, and words like 'isosceles', 'parallel', or 'straight line' point to which rule to use first.
Children apply an angle rule to the wrong triangle or the wrong straight line in a crowded figure, or stop one step before the angle actually asked for.
Worked examples of all 33 patterns and skills, in a booklet you can print.