The diagram below shows a number of points on the unit circle. Which point corresponds to a distance of $\frac{\pi}{2}$π2 units around the circle?
$C$C
$B$B
$D$D
$A$A
The diagram below shows a number of points on the unit circle. Which point corresponds to a distance of $\frac{21\pi}{4}$21π4 units around the circle?
The diagram below shows a number of points on the unit circle. We want to find the point that is $1.6$1.6 units around the circle.
Given that $x=\pi$x=πc represents half a circle, what fraction of the circumference of the unit circle does $x=\frac{\pi}{4}$x=π4c represent?