To prove two triangles are congruent, you need 3 congruent parts in one of the patterns ASA, AAS, SSS, or SAS. Place your pencil on one vertex of the triangle then trace the figure. As you come to each congruent part, write either A for angle or S for side depending on what the part is. After doing so, you will see the pattern A - S - A since a side is congruent between two angles.
A ratio is like a fraction, so since you are provided with the numbers its easy to put it into a ratio depth is 3.8km width is 7600km ratio is 3.8:7600
