![]() In our case, one leg is a base, and the other is the height, as there is a right angle between them. To find the area of the triangle, use the basic triangle area formula, which is area = base × height / 2. For this special angle of 45°, both of them are equal to √2/2. If you know trigonometry, you could use the properties of sine and cosine. Isosceles triangles have two congruent sides and two congruent base angles. In our case, this diagonal is equal to the hypotenuse.
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