Depends on the length of the sides ! The simple formula to calculate the area of a triangle is half the base times the height.
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The base times the height divided by two. Imagine a right triangle is half of a rectangle. The area will also be half.
The area is 22.5 times its height, in square units of area.
There are an infinite number of different triangles, with all different shapes and sizes, that all have 45-degree angles. If it happens to be a right triangle, then it has two 45-degree angles, and it's an isosceles right triangle.
A right angle triangle with 45, 45 and 90 degree angles is similar to an isosceles triangle
A triangle with a 90 degree angle and two 45 degree angles.