What types of fields does moving electricity produce?

1. what is the measure of ∠abc? what is the measure of ∠abd?

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?