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# At a Glance - Special Right Triangles

Right triangles are special by themselves, but there are two magical types of right triangles that we think deserve mentioning: 45-45-90 triangles and 30-60-90 triangles. No, those aren't their bust and waist measurements. We classify them based on their angles since angles are what determine similarity.

#### Example 1

 Find the value of d.

#### Example 2

 Find the value of x.

#### Example 3

 Find the value of y.

#### Exercise 1

Find the values of x and y.

#### Exercise 2

Find the values of x and y.

#### Exercise 3

Find the values of x and y.

#### Exercise 4

Find the perimeter of the figure.

#### Exercise 5

Find the value of x.

#### Exercise 6

Find the perimeter of the largest triangle.

#### Exercise 7

What's the value of y in the figure below?

#### Exercise 8

ABC is a Gandalf (45-45-90) triangle with the 90° angle at A. Find the coordinates of A in quadrant I if given the following coordinates: B (-5, 1) and C (4, 10).