A=788.5 the formula to find a trapezoid is 2h(b₁+b₂) to substitute that, i would be 2(19)(55+28) the answer to that is 788.5 P=125. to find the perimeter, u need o add all the sides to get the perimeter. the formula is P=a+b+c+d to substitute that it would be 55+28+21+21. the answer to that is 125.
