Area of a rectangle is always
The base and height will only always be the same (so the area is constant) for C, if C itself is only moving parallel to the line AB.
Draw a picture of ABC and move C around parallel to AB, you will see the base and height are always the same.
The area of a triangle, of course.
The base and height will only always be the same (so the area is constant) for C, if C itself is only moving parallel to the line AB.
Draw a picture of ABC and move C around parallel to AB, you will see the base and height are always the same.