Groups of change with totals from 1 to 100 cents using the least amount of coins.

Illustration of 36 congruent cubes stacked at various heights with outer edges forming a square. A 3-dimensional…

Triangle with sides labeled with numerals 28, 36, 40 and angles A, B, C labeled.

An isosceles triangle with angles 108, 36, 36

An isosceles triangle with angles 36, 72, 72