Geometry: Common Core (15th Edition)

Use the distance formula: $d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$ $d=\sqrt{(12-0)^2+(3-5)^2}$ $d=\sqrt{12^2+(-2)^2}$ $d=\sqrt{144+4}$ $d=\sqrt{148}$ $d\approx12.2$