Answer:
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.
