TRIANGLE: Now he's 4 cm high and 3 cm wide, like me. He's 12 square cm, so I must be half that… 6 square centimetres! And whatever shape I am it still works! RECTANGLE: You're just really embarrassing ...

Working out square footage is an absolutely essential skill that crops up in countless real-world situations. Whether you're a student moving into your first flat and need to determine how much ...