# Mr. Elhajj's Blog

### Geometry worksheet a

Before you can add or subtract fractions, the fractions need ...

### Tips for working wit

There are 4 combination methods (SSS-SAS-ASA-AAS) that allow us to ...

### Grade 9 - final exam

Lesson 5-2: Zero and negative exponents (updated) Lesson 5-3: Scientific notation and ...

### How old?

Bilal, Ahmad, Salem and Ali are friends. They are all different ages 5, ...

Years ago, a man named Pythagoras found an amazing fact ...

## Grade9: Lesson 5-8 Special right triangles

There are two types of special right triangles and they have the following properties:

45°-45°-90° triangle

In this triangle, the important thing to remember is that the legs have equal length.

Formula: Hypotenuse = √(2)×(Leg)

30°-60°-90° triangle

Formulas

Long Leg = (√3) × (Short Leg)

Hypotenuse = 2. short leg

You can also use the Pythagorean theorem, but if you can see that it is a special triangle it can save you some calculations.

What follows is a PowerPoint presentation that will help you understand the content of the lesson in a better and easier way, (pps).