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

An illustration of a Roman Numeral clock showing 11:15.

An isosceles triangle with angles 15, 82.5, 82.5

An isosceles triangle with angles 150, 15, 15

Right triangle ABC with angles A, B, C labeled and leg of 13 with hypotenuse of 15.