Understand how to spot 45-45-90 and 30-60-90 triangles, and use the side ratios for each respective special right triangle to figure out the side measurements of the shapes.
This packet explains the special right triangle types - 45-45-90 and 30-60-90 - and proves the side ratios and how to use them in real life examples.
This video shows a visual on 45-45-90 triangles and the special ratios, etc. that apply to them.
Here is a real life example using 45-45-90 triangles.
This video explains the ratios of the sides in 30-60-90 triangles.
Here is a real life example problem involving a 30-60-90 triangle.