Question

Measure each angle. Then classify each angle as acute, right, obtuse, or straight.

Answer 1

1. Acute 2. Straight 3. Obtuse 4. Right

Answer 2

Before solving these, we must know;

· A 90° angle forms a right angle.

· A 180° angle forms a straight angle.

· Any angle greater than a 90° angle is considered an obtuse angle (x > 90 = obtuse).

· Any angle less than a 90° angle is considered an acute angle (x < 90 = acute).

(Use a protractor to measure each angle)

Now just eyeing these, I can tell that;

1. Is acute, because it looks like it is smaller than a 90° angle(right angle).

2. Is straight, because it looks fairly like a straight line(which measures 180°).

3. Is obtuse, because it looks greater than a 90° angle(right angle).

4. Is right, because it looks exactly like a 90° angle(right angle).

Steps on how to use a protractor;

• Align the dot in the center of the protractor(which has labeling measurements of inches/centimetres) with the intersection of the angles. It should be straight on the line of the angle you are measuring.
• Use the inner-band of the protractor when measuring an angle that is slanted to the right.
• Use the outer-band of the protractor when measuring an angle that is slanted to the left.