Use the unique properties of a square and a 45 45 90 triangle in order to find the area using just the diameter of the square.
Find the area of a square with a diagonal of 6 units.
The diagonal cuts the square in half creating two 45 45 90 triangles.
The problem involves using the hypotenuse to find the leg length

If you need help in trigonometry I have put together a trigonometry unit. This is one video of the trigonometric unit that contains 14 videos, along with a note-taking guide for each video, Click here for the table of contents:
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