Practice Trig Ratios: Random Angles for Sine and Cosine

This GeoGebra example demonstrates interactive practice of trigonometric ratios by randomly generating angles and asking the learner to enter the corresponding sine value (and/or cosine). It compares user input with the correct function value and provides feedback through an attempts counter and a timer. The main math concepts are the sine and cosine functions, evaluation of trig functions with angles (including expressions involving π), dynamic formula construction, and basic conditional logic to judge correctness. Construction highlights: Random and RandomElement generate the practice parameters; FractionText and SurdText help format numbers for display; Textfield and InputBox1/InputBox2 collect answers; FormulaText is used to build expressions like sin(c·π) and cos(…)=… dynamically; Mod and If constrain/gate values and drive correctness checks; button controls (button1/button2/button3) with Timer and Minutes/Seconds manage the session; a counter variable (e.g., Right) updates “Number of Correct Attempts”. Suitable for middle/high school students and for classroom demos, self-study drills, or quiz-like learning modules focused on trigonometry.