12.03 Circles

Interactive practice questions

A circle centred at ($-4$−4, $1$1) has an $x$x-intercept at ($-2$−2, $0$0).

Use the distance to find the exact radius of the circle.

Easy

4min

Consider the circle with equation $\left(x-0.4\right)^2+\left(y+3.8\right)^2=2$(x−0.4)2+(y+3.8)2=2.

Medium

1min

Consider the circle with equation $\left(x+3.2\right)^2+\left(y-\frac{3}{2}\right)^2=\frac{4}{9}$(x+3.2)2+(y−32)2=49.

Medium

1min

Consider the circle with equation $\left(x-5\right)^2+\left(y+6\right)^2=17$(x−5)2+(y+6)2=17.

Medium

< 1min