![]() In our case, one leg is a base, and the other is the height, as there is a right angle between them. In the above triangle, one among the three angles is 90 degrees, thus it is a right triangle. The figure given below illustrates a right triangle. Sometimes it is specified as having exactly two sides of equal length. You may come across triangle types with combined names like right isosceles triangle and such, but this only implies that the triangle has two equal sides with one of the interior angles being 90 degrees. Of course, if we attempt to accurately construct the points and. From this it follows that the triangles labeled 'beta' are similar and equal to each other, so we have BE+EA CF+FA, meaning the triangle ABC is isosceles. Note: The vertex angle of an isosceles triangle is the angle which is opposite a side that might not be congruent to another side. ![]() To find the area of the triangle, use the basic triangle area formula, which is area = base × height / 2. In geometry, an isosceles triangle is a triangle that has two sides of equal length. Also, since D is the midpoint of BC, its clear that the triangles labeled 'gamma' are equal right triangles, and so PB PC. 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. In our case, this diagonal is equal to the hypotenuse. ![]() ![]()
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