The area of a right angled triangle would be .5 * length *width where the length is the height of the triangle. To find the height of the triangle, take the sine of 45 degrees, which is the degree of the angles other than the 90 degrees, and multiply it by the length of one of the two equal sides. The width of the triangle is the length of the bottom side.
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Area of the right isosceles triangle: 0.5*16*16 = 128 square units
The answer depends on what sort of triangle: right angled, equilateral, isosceles or scalene.
multiply the base of the triangle by the height then halve the answer.
There is no right triangle on the right! (Ignore the length of the hypotenuse of a right triangle.) if you have the length of the two legs (base and the upright side): (base x upright) ÷ 2 = area of the right angle triangle.
do you want to know the area in a isosceles triangle or what?