In circle calculations, which decimal value is commonly used as an approximation for pi?

In circle calculations, which decimal value is commonly used as an approximation for pi?

• A. 2.718
• B. 3.14
• C. 1.618
• D. 3.1416

Answer: (B)

Pi is the ratio of a circle’s circumference to its diameter, and its true value is irrational (about 3.14159265…). For most circle math, a simple rounded form keeps calculations quick and usually accurate enough. The most common approximation is 3.14, which makes formulas easy to use—for example, circumference approximates to 3.14 times the diameter, and area approximates to 3.14 times the radius squared. More precision exists (3.1416), but 3.14 is the standard go-to for everyday problems. The other numbers aren’t related to pi in circle calculations: 2.718 is the base of natural logarithms, and 1.618 is the golden ratio.

Pi is the ratio of a circle’s circumference to its diameter, and its true value is irrational (about 3.14159265…). For most circle math, a simple rounded form keeps calculations quick and usually accurate enough. The most common approximation is 3.14, which makes formulas easy to use—for example, circumference approximates to 3.14 times the diameter, and area approximates to 3.14 times the radius squared. More precision exists (3.1416), but 3.14 is the standard go-to for everyday problems. The other numbers aren’t related to pi in circle calculations: 2.718 is the base of natural logarithms, and 1.618 is the golden ratio.