Pre-test For Tec546: Two-dimensional Shapes: Angles

The figure below is called "obtuse" because it has an angle that is greater than 90 degrees.

Clock C is the correct answer because it is the only clock that has hands that form a right angle. The hour hand and minute hand of Clock C are positioned at 3 and 9 respectively, forming a right angle between them. Clock A and Clock B do not have their hands positioned in a way that forms a right angle.

The figure below is called a right angle. A right angle is formed when two lines or line segments meet at a 90-degree angle. In the given figure, the two lines meet at a 90-degree angle, making it a right angle.

The term "acute" best describes the angle above because an acute angle is an angle that measures less than 90 degrees.

A right angle is the angle that measures exactly 90 degrees. It is formed when two lines intersect and create a square corner. In a right angle, one of the lines is perpendicular to the other, dividing the angle into two equal parts of 45 degrees each.

An acute angle is an angle that measures less than 90 degrees. It is smaller than a right angle (90 degrees) and an obtuse angle (greater than 90 degrees). Therefore, an acute angle is the correct answer because it is the only option that fulfills the condition of having less than 90 degrees.

The figure below is a straight line. It is a one-dimensional geometric shape that extends infinitely in both directions. A line is defined by two points and contains an infinite number of points. It has no width or thickness and can be represented by a straight, continuous curve.

Clock B shows an obtuse angle because the hour hand and minute hand are pointing in opposite directions, creating an angle greater than 90 degrees.

Clock A shows an acute angle between its hands.

An obtuse angle has more than 90 degrees.