Answer: Is itScientists can determine the age of rock layers by using the fossils of extinct species, called index fossils, as a tool to identify the age of a rock layer.
Step-by-step explanation:
the sum of all interior angles in a polygon is
180( n - 2)
n = number of sides
now, this polygon is a quadrilateral, so it has 4 sides, so it's total is just 180( 4 - 2) = 360.