Trigonometry can be very difficult to get a hang of, and that's why it's so important to practice. This tool automatically generates new random triangle problems so that you can practice all of the different variations. We use a handy table to present several problems at once, and every column is a single triangle. You get some values to start with. Use those values to calculate and fill out the unknowns.

Your answers will be checked automatically and change color.

The following triangles are all in the form of the basic 90° right triangle where side **a** is smaller than side **b** and **c** is the hypotenuse. The angle **A°** is opposite side **a** and smaller than angle **B°**.

a | 17.7 | 17.3 | 20.5 | 20.9 | |||||
---|---|---|---|---|---|---|---|---|---|

b | 41.5 | 42.3 | 52.6 | 61.6 | |||||

c | 48.1 | 56.9 | 44.4 | 59.0 | |||||

A° | 15.5 | 27.4 | 20.6 | ||||||

B° | 72.9 | 65.1 | 69.5 |

You can also print out an A4 sheet with 3 sets if you prefer to work on paper. The sheet includes the correct answer in the traditional upside-down configuration.