Geometry Puzzle – Challenge 73
A square with perimeter 13 cm has side 13/4 cm. An equilateral triangle with perimeter 7 cm has side 7/3 cm. The difference of the sides: 13/4 – 7/3 = 39/12 – 28/12 = 11/12 cm. Key takeaways: Side of square = perimeter / 4 = 13/4 cm. Side of equilateral triangle = perimeter / […]
Geometry Puzzle – Challenge 72
A rectangle’s length is three times its width. What is the ratio of its width to its perimeter? Let width = X. Then length = 3X, and perimeter = 2X + 2(3X) = 8X. So width-to-perimeter = X: 8X = 1: 8. Key takeaways: Perimeter of rectangle = 2(length + width). If length = 3X […]
