The area of the rectangle ABCD is 21mm².
To find the area of the shape, we need to identify what shape it is.
From the information given, we know that BM is perpendicular to AD, which means ABCD is either a rectangle or a parallelogram.
Since BM is perpendicular to AD, it is also perpendicular to BC.
Therefore, ABCD is a rectangle.
The area of a rectangle is the product of its length and width.
In this case, the length is AD which is 7mm and the width is BC which is 3mm. So the area of the rectangle ABCD is 7mm * 3mm = 21mm².
The probable question may be:
Find the area of the shape.
in figure ABCD BM is perpendicular to AD.
BM=8mm, AD=7mm, BC=3mm