Use this Calculator to lay-out or measure angles and side lengths by entering 2 known values. Enter Side Lengths and either
top Angle or Base length to calculate all other side lengths, angles and triangle height, and re-draw the scaled diagram.

Drag the Top Angle slider to alter top angle and animate the diagram.

Top Angle

Side Lengths

Angle

Base

Enter Side Lengths and click Angle textbox input or Base textbox input to select (turns green) and enter its value.
Hit Calculate button to calculate, re-draw and display all other angles, side lengths and triangle height, from currently selected entry (Angle or Base - green).

Use this Calculator to lay-out 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: to measure an existing angle, measure the Side Length entry down both sides form the top angle, then measure across
(the Base) and enter into the Base textbox to calculate the angle.

To lay-out a known angle, enter the Angle and Side Lengths to calculate the Base length needed to mark out the correct angle.

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