What is the area of a circle with diameter 12 mm?

12$\pi$ mm² 24$\pi$ mm² 36$\pi$ mm² 48$\pi$ mm²

36$\pi$ mm²

Area of circle = $\pi r^2$, r = radius  If diameter = 12 mm, radius = d/2 = 6 mm Thus, area = $\pi 6^2$ = 36$\pi$ mm²