Answer:
Explanation:
This is a square that a triangle has been removed from it.
It requires that we calculate the area of the square and remove the area of the triangle from it:
Area of the square = l^2 = 31m x 31m = 961msq
Area of the triangle = 1/2 * base * height
base = 31 (the tiny green line)
height = 6m (the green indicator in the middle)
Hence, the Area of the triangle = 1/2 * 31m * 6m = 93msq
Therefore, the Area of the shaded region = 961msq - 93msq = 868msq
To the nearest ten: 8 will be rounded up to make the result 870msq