Answer:
294 m² is correct
Step-by-step explanation:
The area (A) of a trapezoid is calculated using the formula
A = [tex]\frac{1}{2}[/tex] h (a + b)
where h is the height and a, b the parallel bases
here h = 21, a = 21 and b = 7, thus
A = [tex]\frac{1}{2}[/tex] × 21 × 28 = 294 m²
