volume_mute
Complete the Circumference Formulas
publish date: 2026/05/17 03:18:35.385829 UTC
Drag the correct expression into each placeholder.
Formula 1 (using diameter): \(C =\) (1) \(\times D\)
Formula 2 (using radius): \(C =\) (2) \(\times r\)
π is defined as: \( \pi = \dfrac{C}{?} \) (3)
Semicircle perimeter: \(P =\) (4) \(\times \pi D\)
Please drag and drop the selected option in the right place or type it instead
π
2π
D
½
Correct Answer
(1) π
(2) 2π
(3) D
(4) ½
Explanation
Formula 1: \(C = \pi D\) — multiply \(\pi\) by the diameter.
Formula 2: \(C = 2\pi r\) — multiply \(2\pi\) by the radius.
π definition: \(\pi = C/D\) — the ratio of circumference to diameter.
Semicircle: \(P = \tfrac{1}{2}\pi D\) — half the full circumference.
Reference
Mathematics for college students