ITS MUltipling by 3 silly its 243
Fourth root of 35. You take the denominator and make that the number above the root of sign and the numerator is how many times it is multiplied
Area of the big triangle (shaded area and small tris for below) is 36 * 51 divided by 2 (area of triangle is base * height over 2). this would give you 918.
area of the small triangle below is 51 * 11 divided by 2 (see above), which is 280.5.
shaded shape area is the big triangle shape minus the small triangle below, which is 918-270.5, which is 637.5 units.