If triangle DEF has vertices D (-8,3), E (-1,5) and F (-3,-6), find the area of the triangle

hep the ratio of the weight of shawn's dog to the weight of andy's dog is 5: 7 shawn's cat weight 23kg approimately how much does andy's dog weigh

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

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?