It started, and ended, with a roll of the teenager’s eyes, and one sum.
“Who calls it a sum, anyway? It’s an equation, Mum.”
I’ve got this, I retorted. Year 10 Maths. That confidence – along with the brand new school bell I’d purchased just before self-isolating – would have me respected, revered even, and being called Ma’am, before morning tea.
An isosceles triangle is constructed with equal sides of 15cm and an obtuse angle of 120 degrees. Determine the size of the third side and the other two angles.
I stared at it. Isosceles. I remembered the word, but thought it might have been the surname of a lad I dated in the 1980s, at Queensland University.