0.5 x side a x side b
where a and b are any side except the longest one (the hypotenuse)
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I quote " The square on the hypotenuse of a rightangled triangle..."
a right angled triangle with the remaining angles both being 45 degrees will be a rightangled triangle and an isosceles triangle.
Turn the triangle into a square work out the area for that then half your answer ---- For an equilateral triangle, use the formula 1/2 x base x perpendicular height to work out the area.
The area of any triangle has the same formula, which is base times height, divided by 2. A scalene triangle is a triangle with three sides of unequal length, which is not important when calculating the area.
A right triangle is easy, simply multiply the two sides and divide by two. A non-right triangle is a bit more of a challenge. You have to make it a right triangle by adding a right triangle to it. Calculate and then subtract the area of what you had to add.