Area of a right angle triangle is: 0.5*base*height
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The area of a 12cm by 5cm right-angled triangle is: 42 cm2
The area of any triangle is1/2 of (the length of the triangle's base) times (the triangle's height).
A=bxh
The length of the hypotenuse, alone, is not sufficient to determine the area of a triangle.
A right triangle has a hypotenuse of length 10 and a leg of length 7 has an area of: 24.99 units2