Question 962954
Area of the triangle: (b*h)/2 (base times height divided by 2)
We need to find the height, which is the missing leg. Using Pythagoras:
{{{sqrt(11^2- 4^2)}}}= height
{{{sqrt(121-16)}}} = 10.25
Now let's go back to the formula for the area:
(4*10.25)/2 = 20.5cm^2 is the area of your triangle.