Click on the polygons to calculate the area (except the square, which shows you quadrilaterals). If you answer the questions correctly, it will tell you the area of the shape. I can't make it hide the questions when you press back (if anyone can tell me how, please do).
Triangle: Height*Base/2 Rectangle/Square: Length*Height or Length*Width Rhombus/Kite: Longer Diagonal*Shorter Diagonal/2 Parallelogram: Base*Height Trapezium/oid: [(Base+Opposite Base)/2]*Height Pentagon: 0.25*√5*(5+2*√5)*Length*Length Hexagon: [(3*√3)/2]*Length*Length Heptagon: 1.75*Length*Length*[cos(180/7)/sin(180/7)] Octagon: 2*(1+√2)*Length*Length Enneagon/Nonagon: 2.25*Length*Length*[cos(180/9)/sin(180/9)] Decagon: 2.5*Length*Length*√(5+2*√5)
