Right Triangles
Rules, Formula and more
Pythagorean Theorem
The sum of the squares of the lengths of the legs equals the square of the length of the hypotenuse .
Usually, this theorem is expressed as $$ A^2 + B^2 = C^2 $$ .
Right Triangle Properties
A right triangle has one $$ 90^{\circ} $$ angle ($$ \angle $$ B in the picture on the left) and a variety of often-studied formulas such as:
- The Pythagorean Theorem
- Trigonometry Ratios (SOHCAHTOA)
- Pythagorean Theorem vs Sohcahtoa (which to use)
SOHCAHTOA only applies to right triangles ( more here ) .
A Right Triangle's Hypotenuse
The hypotenuse is the largest side in a right triangle and is always opposite the right angle.
In the triangle above, the hypotenuse is the side AB which is opposite the right angle, $$ \angle C $$.
Online tool calculates the hypotenuse (or a leg) using the Pythagorean theorem.
Practice Problems
Below are several practice problems involving the Pythagorean theorem, you can also get more detailed lesson on how to use the Pythagorean theorem here .
Find the length of side t in the triangle on the left.
Substitute the two known sides into the Pythagorean theorem's formula : A² + B² = C²
What is the value of x in the picture on the left?
Set up the Pythagorean Theorem : 14 2 + 48 2 = x 2 2,500 = X 2
$$ x = \sqrt{2500} = 50 $$
$$ x^2 = 21^2 + 72^2 \\ x^2= 5625 \\ x = \sqrt{5625} \\ x =75 $$
Find the length of side X in the triangle on on the left?
Substitue the two known sides into the pythagorean theorem's formula : $$ A^2 + B^2 = C^2 \\ 8^2 + 6^2 = x^2 \\ x = \sqrt{100}=10 $$
What is x in the triangle on the left?
x 2 + 4 2 = 5 2 x 2 + 16 = 25 x 2 = 25 - 16 = 9 x = 3
Ultimate Math Solver (Free) Free Algebra Solver ... type anything in there!
Popular pages @ mathwarehouse.com.
IMAGES
VIDEO