For example
The hands of a clock at 4 o'clock make an obtuse angle.
In Grade 5
Children sort the angles that are bigger than a square corner but less than a straight line.
Watch out for
Children often call any large angle obtuse. Past a straight line it becomes a reflex angle instead.
Say it at home
Open a door partway and ask whether the angle is bigger than a square corner.
Try it together
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