Who Needs the Right Formula, Anyway?Math brain teasers require computations to solve.
This morning I asked my math class to find the areas of two right-angled triangles. Lottie-Lu's hand shot up immediately, so I asked her the first one.
"24" she announced.
She was right (for a change!) and I made the mistake of asking her how she did it.
"Easy. Just add all the sides together."
I was about to correct her and say it was just a coincidence, when I noticed that her method worked on my second triangle as well!
Lottie-Lu must have caught my frustrated thoughts. "Well, it works, doesn't it?" she chirped.
What were the side lengths of the two triangles I had drawn on the board this morning? They were all whole numbers.
HintUse the fact that all three sides of each triangle were whole numbers.
Answer1. 6-8-10 (Area = 6x8/2 = 24)
2. 5-12-13 (Area = 5x12/2 = 30)
See another brain teaser just like this one...
Or, just get a random brain teaser
If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.
Back to Top