C = 3
You isolate the variable by dividing each side by factors that don’t contain the variable
Sixty miles over four gallons would reduce down to 15 miles over one gallon which would 15 miles per gallon.
HL (It's a right triangle and the hypotenuse and leg are congruent. This can also be thought of as SAS.)
SAS (Side angle side. All congruent.)
SSS (Line AR is shared by both triangles. A line is always congruent on itself. The other two are self explanatory.)
ASA and AAS cannot be used because we can only confidently confirm one angle of each triangle.
