Obtuse Triangle Calculator

"Obtuse" describes a triangle that comprises:

• 1x angle that measures over 90 degrees (>90°), called an obtuse angle; and
• 2x angles that measure less than 90 degrees (<90°), called the acute angles.

The obtuse triangle is one of two types of oblique triangles - the other one is acute.

Angles are all you need to determine whether the triangle is obtuse!

1. Take a look at your known triangle angles - if one of them is greater than 90 degrees, your triangle is obtuse. ✅
2. If you know only 2 angles of your triangle, use the equation below:

Angle(α) = 180 - Angle(β) - Angle(γ)

You can calculate the area of an obtuse triangle using every typical equation for a triangle area.

Let's enumerate a few examples:

• Area = 0.5 × Base × Height
• Area = 0.25 × √( (a + b + c) × (-a + b + c) × (a - b + c) × (a + b - c) )
• Area = 0.5 × a × b × sin(γ)

Where:

• a, b, and c are the length of the obtuse triangle's sides.

It's probably the easiest thing on earth! 🌍

Enter one, two, or three angles of your triangle - our obtuse triangle sides calculator will show you the answer straight away!

Aside from identifying whether or not your triangle is obtuse, you may also use our tool to calculate its area! Go ahead and choose from multiple options available.

The obtuse triangle calculator is a part of a bigger series of tools - discover them all! 🛠️

• Triangle area;
• AAA triangle;
• Midsegment of a triangle;
• Acute triangle;
• Circumcenter of a triangle;
• Triangle congruence;
• Oblique triangle;
• Base of a triangle;
• AAS triangle;
• SAS triangle;
• SSS triangle; and
• ASA triangle.