Question 9
An equilateral triangle of integral side length, in cm, is said to be “good” if we can use some number of pieces of an isosceles trapezoid of side lengths 1 cm, 1 cm, 1 cm and 2 cm, to completely cover the triangle. (Note that the isosceles trapezoids join side by side and cannot overlap.)
What is the minimum possible side length, in cm, of a “good” triangle with side length equal to or greater than 10 cm?
What is the minimum possible side length, in cm, of a “good” triangle with side length equal to or greater than 10 cm?