The answer is D because the opposite sides are equal to each other, so you have 2 of each measurement. Also, midsegments divide each side of the bigger triangle in half. So 2 (1/2AC + 1/2AB)= the perimeter of the quadrilateral but the 2 in front will cancel out both halves, so we are left with AC+AB (OPTION D)
PEMDAS states that the value in the parenthesis should be evaluated first: 4(5*6) 4(30) After just multiply the value in the parenthesis by the number outside of the parenthesis: 120
