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: 454590 triangles and 306090 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 (454590) 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).