Amid a grid full of the letter B, a single number 3 is hidden, challenging viewers' observation skills. This optical trick ...

Count the number of sides and corners on each of the shapes. Shape A, B and D all have 4 sides and 4 corner. Shape C is a triangle. It has 3 sides and 3 corners, so it is the odd one out.

Two-dimensional (2D) shapes are completely flat. They cannot be picked up. 2D shapes can be found printed in a book or you can draw them on a piece of paper. 2D shapes have sides and corners (also ...