Answer:
first calculate the area of the rectangle which is given by L×W
take thw length of the rectangle and substract the b of the trapezium which 4.5 you find y divide it by 2 since they're two. the answer you'll get is the height of both shaded triangles . take the base of the shaded triangles and the height y then find the area. the answer you'll get multiply it by 2.
Step-by-step explanation:
11×7=77
11-4.5=6.5
6.5/2
(½×7×6.5/2)2
=22.75m²
