Use the formula a=1/2 bh to find the area of the triangle b= 5 1/2 and h=3 /14

Triangle area = 1/2 times base times height
Triangle area = 1/2 x 5 1/2 x 3/14 (does not look like correct number)
Triangle area = 0.5 x 5.5 x 0.21
Triangle area = 0.5775

Did you mean:
Triangle area = 1/2 x 5 1/2 x 3 1/4   ???
Then
Triangle are = 0.5 x 5.5 x 3.25
Triangle area = 8.9375

You might need to keep it in fractions.