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

An illustration of a Roman Numeral clock showing 6:40.

An illustration of a right triangle with sides, 40, 75, and x. Additional height of x is added to 75.…

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

An isosceles triangle with angles 100, 40, 40

An isosceles triangle with angles 40, 70, 70