Given:
Sheet of paper with dimensions: 6 inches by 10 inches
Cut into 15 congruent circles.
Area of the paper = 6 inches x 10 inches = 60 in²
60 in² / 15 circles = 4 in²
Area of a circle = π r²
A = 3.14 * (1in)²
A = 3.14 in²
Out of a 4 in² piece of paper, only 3.14 in² can be used to form a circle that has a radius of 1 in.
3.14 in² x 15 pcs = 47.10 in² total area of all 15 circles
60 in² - 47.10 in² = 12.90 in² paper is wasted.