Find the length of C using the Pythagorean theorem

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?

Having a hard time understanding this question (see attachment).

Find two consexutive odd integers such that the sum of their square is 650