Over here, we can use the Pythagorean theorem which states that in a right triangle, a^2+b^2=c^2
The width measures 12 and the diagonal measures 20, so we have a and c, so 144+b^2=400 which simplifies to b^2=256. The square root of 256 is 16 so that's our length
Then we just plug in the formula to find the area of a rectangle which is l*w, so 12*16=192
