Angles

What is an obtuse angle?

• An angle that measures exactly 90 degrees.

• An angle that measures less than 90 degrees.

• An angle that measures more than 90 degrees but less than 180 degrees.

• An angle that measures exactly 180 degrees.

What is a straight angle?

• An angle that measures exactly 90 degrees.

• An angle that measures exactly 180 degrees.

• An angle that measures less than 90 degrees.

• An angle that measures more than 180 degrees.

What is the difference between acute and obtuse angles?

• Acute angles are greater than 90 degrees, while obtuse angles are less than 90 degrees.

• Acute angles are less than 90 degrees, while obtuse angles are greater than 90 degrees but less than 180 degrees.

• Acute angles are equal to 90 degrees, while obtuse angles are greater than 180 degrees.

• Acute angles are less than 45 degrees, while obtuse angles are between 45 and 90 degrees.

What is a right angle?

• An angle that measures exactly 90 degrees.

• An angle that measures exactly 45 degrees.

• An angle that measures less than 90 degrees.

• An angle that measures more than 90 degrees.

What are vertical angles?

• Angles that are adjacent to each other when two lines intersect.

• Angles that are opposite each other when two lines intersect, and they are always equal.

• Angles that are supplementary to each other when two lines intersect.

• Angles that are complementary to each other when two lines intersect.

What is the significance of angle bisectors?

• An angle bisector is a line that divides an angle into two equal parts.

• An angle bisector is a line that measures the angle's size.

• An angle bisector is a line that connects the angle's vertex to the opposite side.

• An angle bisector is a line that creates a right angle with the adjacent sides.

How can you classify angles based on their measures?

• Acute (<90°), Right (=90°), Obtuse (>90° and <180°), Straight (=180°)

• Acute (<45°), Right (=90°), Obtuse (>90° and <150°), Straight (=180°)

• Acute (<90°), Right (=90°), Obtuse (>90° and <270°), Straight (=360°)

• Acute (<90°), Right (=90°), Obtuse (>90° and <180°), Reflex (>180°)

How do you measure angles using a protractor?

• Align the baseline of the protractor with one side of the angle and read the measurement where the other side intersects the protractor scale.

• Place the protractor on the angle and rotate it until it matches the angle's vertex.

• Draw a line from the vertex to the protractor's center and measure the angle in degrees.

• Use the protractor to draw the angle first, then measure it afterwards.

What is a reflex angle?

• An angle that measures exactly 180 degrees.

• An angle that measures less than 90 degrees.

• An angle that measures more than 180 degrees but less than 360 degrees.

• An angle that measures exactly 360 degrees.

How do you identify an acute angle visually?

• An acute angle appears sharp and is smaller than a right angle.

• An acute angle is larger than a right angle.

• An acute angle is a straight line.

• An acute angle appears rounded and is equal to a right angle.