visualtrig.com

Visual Trigonometry Calculator  Find Angles, Sides, Areas and Trigonometry Formulas

Enter side lengths and click either Top Angle input or Base Length input to select (turns green) and enter its known value.
Hit Calculate to calculate, redraw and display all other angles, side lengths and triangle height, from selected entries.
Mouse over arrows
to auto increment / decrement the Top Angle and redraw the Isosceles Triangle repeatedly to animate.
Use this Isosceles Triangle Calculator to layout or measure angles and side lengths by entering 2 known values (Side Lengths and either Top Angle or Base Length) to find all other side lengths, angles and triangle height.
E.g: on a construction site, to measure an existing angle, measure down both sides form the top angle, then measure across (the base) to find entries needed to calculate the angle.
To layout a known angle, enter the angle and side lengths to calculate the base length needed to mark out the correct angle.

