## Trigonometry 7th Edition

To calculate distance between given points, i. e. origin (0, 0) and (3,-4), we will use distance formula- r = $\sqrt { (x_{2} - x_{1}) ^{2} + (y_{2} - y_{1}) ^{2}}$ = $\sqrt { (3 - 0) ^{2} + (-4 - 0) ^{2}}$ = $\sqrt { (3) ^{2} + (-4) ^{2}}$ = $\sqrt {9 +16}$ = $\sqrt {25}$ = 5