Triangle Solving Practice

Practice solving triangles.

You only need to know:

• Angles Add to 180°
• The Law of Sines
• The Law of Cosines

Try to solve each triangle yourself first, using pen and paper.

Then use the buttons to solve it step-by-step (more Instructions below).

Instructions

• Look at the triangle and decide whether you need to find another angle using 180°, or use the sine rule, or the cosine rule.  Click your choice.
• The formula you chose appears, now click on the variable you want to find.
• The calculation is done for you.
• Click again for other rules until you have solved the triangle.

Note: answers are rounded to 1 decimal place.

What Does "AAS", "ASA" etc Mean?

It means which sides or angles we already know:

AAA
Three Angles

AAS
Two Angles and a Side not between

ASA
Two Angles and a Side between

SAS
Two Sides and an Angle between

SSA
Two Sides and an Angle not between

SSS
Three Sides