Mathematics for IGCSE & O level - Mensuration (Section 10 - No. 19)
Which of the following is the correct equation for circumference?
C = πd
C = 2πr
A = πr²
V = πr²h
คำอธิบาย
The circumference can be found by the formula C = πd or C = 2πr, where d=diameter and r=radius