25.1 Starting from the Right Triangle: Trig Ratios of Acute Angles
Point 3 of 6
25.1.3 Trig Values of Special Angles
Core idea
Think of 30°, 45°, and 60° as three handy building blocks — memorize their sin, cos, and tan and you can snap answers together on the spot.
Module goal. Carrying the function idea forward, we first build the link between an angle and the ratios of sides inside the most familiar shape — the right triangle — and learn to use it to measure real heights and distances.
eastmath.com · 25.1 Starting from the Right Triangle: Trig Ratios of Acute Angles · 25.1.3 Trig Values of Special Angles