Final answer:
A right angle, a straight line, an acute angle, and a negative angle can be represented by 90 degrees, 180 degrees, 45 degrees, and 270 degrees respectively.
Step-by-step explanation:
A) 90 degrees
In terms of a positive acute angle, 90 degrees represents a right angle. It is formed when two lines intersect perpendicularly, creating four 90-degree angles.
B) 180 degrees
180 degrees represents a straight line. It is formed when two lines are collinear, or lie on the same line. It is considered an angle because it measures the rotation or deviation from the horizontal or vertical direction.
C) 45 degrees
45 degrees is an acute angle formed when two lines intersect and create two congruent and perpendicular angles. It is commonly found in right triangles.
D) 270 degrees
In terms of a positive acute angle, 270 degrees represents a negative angle. It can be visualized as a clockwise rotation of 90 degrees from the vertical axis.