# Obtuse Triangle Calculator

Welcome to the one and only **obtuse triangle calculator** - wonder no more; this simple tool will not only calculate the area of your triangle but also **determine whether it's really obtuse or not**!

Read on to discover:

*How to calculate the area of an obtuse triangle*; 🔺*How to find out whether your triangle is obtuse*; and*How to use the obtuse triangle calculator*.

## What is an obtuse triangle?

"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.

## How to determine whether the triangle is obtuse?

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

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

`Angle(α) = 180 - Angle(β) - Angle(γ)`

## How to calculate the area of an obtuse triangle?

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.

## How to use the triangle type calculator?

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 full list of triangle area calculators:

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

## FAQ

### What triangle type has an angle greater than 90 degrees?

An obtuse triangle has exactly one angle greater than 90° - called the obtuse **angle**.

Two other angles of the obtuse triangle are **acute** - they measure less than 90°.