What does AAS mean in triangle calculations?

AAS stands for Angle-Angle-Side. It means you know two angles and a side that is not between them. This calculator uses those inputs to find the remaining side, angle, area, and perimeter.

How do I find the missing angle in an AAS triangle?

The sum of all angles in a triangle is always 180 degrees. So, subtract the two given angles (Angle A and Angle B) from 180 to get the third angle. The calculator does this automatically.

Can I use this calculator if I only know two angles and the side between them?

No, that is an ASA (Angle-Side-Angle) triangle. This calculator is specifically for AAS, where the known side is not between the two given angles. For ASA, you would need a different tool.

数学

即时、私密且免费

AAS Triangle Calculator.

Solve the missing side, angle, area, and perimeter of a triangle from two angles and a non-included side.

设备端计算无需注册

输入数值

输入时结果会更新。

02 / 答案

Angle A (degrees)

Angle B (degrees)

Side a

结果

C = 90.000000° · b = 8.660254 · c = 10.000000 · Area = 21.650635

Use Cases

Geometry homework and exam prep

Quickly verify your manual calculations for AAS triangle problems, ensuring you get the correct side lengths, area, and perimeter.

Example: Given Angle A=40°, Angle B=60°, and side a=10, find the missing values.

Construction and design planning

Determine unknown dimensions of triangular components when you know two angles and one side, useful for framing, trusses, or land surveys.

Example: Calculate the length of a roof rafter when you know the pitch angles and one known side.

Frequently Asked Questions

What does AAS mean in triangle calculations?: AAS stands for Angle-Angle-Side. It means you know two angles and a side that is not between them. This calculator uses those inputs to find the remaining side, angle, area, and perimeter.
How do I find the missing angle in an AAS triangle?: The sum of all angles in a triangle is always 180 degrees. So, subtract the two given angles (Angle A and Angle B) from 180 to get the third angle. The calculator does this automatically.
Can I use this calculator if I only know two angles and the side between them?: No, that is an ASA (Angle-Side-Angle) triangle. This calculator is specifically for AAS, where the known side is not between the two given angles. For ASA, you would need a different tool.

Tips & Common Mistakes

Tips

Ensure Angle A and Angle B are in degrees, not radians, before entering them.
The sum of Angle A and Angle B must be less than 180 degrees for a valid triangle.
Side a is the side opposite Angle A. Double-check that you are entering the correct side corresponding to the given angle.
Use the calculated area and perimeter to cross-check your own work or to plan material quantities.

Common Mistakes to Avoid

Entering angles in radians instead of degrees, leading to incorrect results.
Confusing which side is 'a' – it must be opposite Angle A, not just any side.
Assuming the given side is between the two angles, which would be an ASA triangle, not AAS.

Last updated: August 13, 2026