# Why Trigonometry is based on right angle triangle?

Table of Contents

## Why Trigonometry is based on right angle triangle?

Trigonometry is applied in any right angled triangle because we know that triangle angle sum is 180 and if it is right angle triangle than the other angle are less than 90 and it will come in first quadrant where all the sin ,cos and tan are positive but when we move further on 2 quadrant cos and tan is negative and in …

## Is Trigonometry only for right angled triangles?

A: Yes, it only applies to right triangles. If we have an oblique triangle, then we can’t assume these trig ratios will work. We have other methods we’ll learn about in Math Analysis and Trigonometry such as the laws of sines and cosines to handle those cases.

**Which type of triangle is related to Trigonometry?**

Answer: Trigonometry is most simply associated with planar right angle triangle.

**Can you use trig on obtuse triangles?**

The sine rule is also valid for obtuse-angled triangles. = for a triangle in which angle A is obtus. We can use the extended definition of the trigonometric functions to find the sine and cosine of the angles 0°, 90°, 180°.

### Does Pythagoras theorem only work for right-angled triangles?

The hypotenuse is the longest side and it’s always opposite the right angle. Pythagoras’ theorem only works for right-angled triangles, so you can use it to test whether a triangle has a right angle or not.

### Where is trigonometry used?

Trigonometry is used to set directions such as the north south east west, it tells you what direction to take with the compass to get on a straight direction. It is used in navigation in order to pinpoint a location. It is also used to find the distance of the shore from a point in the sea.

**How do you know if an angle is obtuse or acute?**

Acute angles measure less than 90 degrees. Obtuse angles measure more than 90 degrees.

**Why do we use a right-angled triangle in trigonometry?**

For trigonometry, we use a right-angled triangle with an hypotenuse exactly one unit long. We measure tangent and cotangent on the triangles who have a radius (Length = 1) as the adjacent and the opposite side, respectively, to the angle θ. Originally Answered: Why should we use the right-angled triangle in trigonometry?

## What is the difference between acute and obtuse triangles?

A right triangle, has one of its interior angles measuring. A triangle that has one angle that measures more than is an obtuse triangle. A triangle that has all interior angles measuring less than is an acute triangle.

## How do you classify a right triangle?

Triangles can also be classified according to their internal angles : A right triangle, has one of its interior angles measuring. A triangle that has one angle that measures more than is an obtuse triangle. A triangle that has all interior angles measuring less than is an acute triangle.

**How is trigonometry used in engineering and surveying?**

This allows trigonometry to be easily applied to surveying, engineering, and navigation problems in which one of a right triangle’s acute angles and the length of a side are known and the lengths of the other sides are to be found. The fundamental trigonometric identity is sin^2 θ + cos^2 θ = 1, in which θ is an angle.