Step-by-step explanation:
Ciro made a sign in the shape of a trapezoid.
The parallel sides measured 18 inches and 35 inches
The distance between these sides was 19 inches, such that the height of trapezoid.
The area of Ciro's sign = Area of trapezoid = [tex]\frac{1}{2} (P_{1} + P_{2})h[/tex]
= [tex]\frac{1}{2} (18 + 35)19[/tex]
The area of Ciro's sign = 503.5 square inches