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Home » Blog » topic » The Complete Guide To The 30 -60 -90 Triangle
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The Complete Guide To The 30 -60 -90 Triangle

The Knowledge BlogBy The Knowledge BlogMarch 2, 2022Updated:March 2, 2022No Comments5 Mins Read
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30 -60 -90 Triangle
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Table of Contents

  • The Complete Guide To The 30 -60 -90 Triangle
  • What Is A 30 -60 -90 Triangle?
  • Why 30 -60 -90 Works?
    • Right Angle Properties
  • When To Use 30-60-90 Triangles?
  • FAQ’s
    • What are the rules for a 30 60 90 right triangle?
    • Can 30 60 90 angles form a triangle?

The Complete Guide To The 30 -60 -90 Triangle

The 30 -60 -90 Triangle is an accurate right triangle, and knowing it can save you a lot of time on standardized tests like the SAT and ACT.

Because its angles and aspect ratios are consistent, testers like to incorporate this Triangle into problems, particularly the part of the SAT without a calculator.

It is what you need to know about the 30-60-90 Triangle.

What Is A 30 -60 -90 Triangle?

A 30-60-90 triangle is a right angle triangle with angles of 30º, 60º and 90º (the right angle).

Since the angles are always in this relationship, the sides are always in the same connection.

The side of the Triangle opposite the 30º angle is the shortest, and the length is usually marked with x.

Then, the side that is opposite the 60º angle has a length of x root 3.

The side of this Triangle opposite the 90º angle has the greatest size and equals 2x.

Knowing this ratio, you can easily identify the missing information about a triangle without doing more complicated calculations.

Standardized testing can save you time troubleshooting when you see the relationship between angles and sides.

Therefore, you don’t need to use properties of triangles like the Pythagorean theorem.

30 -60 -90 Triangle

Why 30 -60 -90 Works?

How many of you know that the side lengths of the 30-60-90 Triangle are always in proportion?

Although we can use geometric proof, it is probably more useful to check the properties of triangles since knowing these properties will help you with other problems in geometry and trigonometry.

Here are some triangle properties to keep in mind:

Firstly, in any triangle, the angles can add up to 180º.

In other words, if we know the measure of two of the angles, we can find the measure of the third side by subtracting the measurement of both angles from 180.

In any other triangle, the side opposite the smallest angle is always the shortest, while the opposite the angle is always the longest.

Triangles with the same degrees are similar, and their sides have the same proportion to each other.

It means that all 30-60-90 triangles are similar, and we can use this information to solve similarity problems.

Right Angle Properties

Also, here are some triangle properties specific to right triangles:

In the right triangles, the side opposite the 90º angle is called the hypotenuse, and the other two sides are the legs.

In right triangles, the Pythagorean theorem explains this relationship between the legs and the hypotenuse: the total sum of the length of each leg squared is equal to the size of the hypotenuse squared, or

Based on this detailed information, if a problem says that you have a right triangle, we know that one of the angles is 30º.

Also, we can use the first property listed to know that the other angle is 60º.

It is how 30-60-90 triangles often appear on standardized tests, like a right angle triangle with an angle measuring of 30º or 60º, and you have to realize that it’s 30-60-90.

Not only that, but the right angle of a right triangle is always the largest: using Property 1 again, the other two tips must add up to 90º.

It means neither of them can be greater than 90º.

Since the right angle triangle is always the largest, property 2 of the hypotenuse is always the longest side.

The Pythagorean theorem shows that the aspect ratio works with the 30-60-90 base triangle above.

With Property 3, we know that all 30-60-90 triangles are similar and equal sides.

30 -60 -90 Triangle

When To Use 30-60-90 Triangles?

For geometry problems: By knowing these three pieces of information, one of which is that the Triangle is a right triangle.

We can easily solve for missing information, such as angle measurements and side lengths.

With three pieces of information, usually two squares and one side, or 1 square and two sides, you can fill in the rest of the Triangle.

For trigonometry problems: if you know the basic definitions of sine, cosine and tangent, it is very easy to find the value of any triangle.

The sine, cosine, and tangent represent a ratio of the sides of a triangle based on one of the angles indicated as theta or.

Because the aspect ratio is the same for all 30-60-90 triangles, the sine, cosine, and tangent values ​​are always the same, particularly the following two, which we use commonly in standardized tests:

sine 30 is 1/2

cosine 60 is 1/2

FAQ’s

What are the rules for a 30 60 90 right triangle?

The 30-60-90 triangle rule is used to find the lengths of two sides given one side.

The shortest side opposes the 30-degree angle, the longest side opposes the 60-degree angle, and the hypotenuse opposes the 90-degree angle.

Can 30 60 90 angles form a triangle?

A 30 -60 -90 triangle is a right triangle with angles measuring 30º, 60º, and 90º (the right angle).

Since the angles are always in this relationship, the sides are always in the same relationship.

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