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What is the 45° 45° 90° Triangle?

A 45° 45° 90° triangle (or isosceles right triangle) is a triangle with angles of 45°, 45°, and 90°, 45° 45° 90° triangle is also known as special right triangles.

What is the formula for 45° 45° 90° Triangle?

If the leg of the triangle is equal to a, then:

the second leg is also equal to a

the hypotenuse is a√2

the area is equal to a²/2

the perimeter equals a(2 + √2)