These Stage 3 and 4 problems have not yet been solved. Can you be the first?
These Stage 4 and 5 problems haven't been solved yet. Can you be the first?
Do you have enough information to work out the area of the shaded quadrilateral?
Take any four digit number. Move the first digit to the end and move the rest along. Now add your two numbers. Did you get a multiple of 11?
Can you work out the fraction of the original triangle that is covered by the inner triangle?
Try out some calculations. Are you surprised by the results?
Can you work out the fraction of the original triangle that is covered by the green triangle?
Draw some angles inside a rectangle. What do you notice? Can you prove it?