![]() ![]() Straight AngleĪ straight angle is exactly 180 degrees. Another tip to remember, you can make an obtuse angle by drawing a right angle and then adding more degrees to the second line. ![]() The image above shows exactly how they are opposite to each other (blue and green angles). Obtuse angle is the opposite of acute angle. Obtuse angles are more than 90 degrees, but less than 180 degrees. A “V” shape is an example of an acute angle. ![]() Refer to the shaded blue angles in the image above, notice the small spaces from 0 and 90 degree lines indicating that acute angles are less than 90 degrees, but more than zero degrees. This angle is smaller than the right angle, which is exactly 90 degrees. Acute AngleĪcute angles are less than 90 degrees, but more than zero degrees. A full circle is exactly 360 degrees and 1/4 of it is equivalent to 90 degrees. Keep this in mind: A right angle is equivalent to 1/4 turn of a circle. A right angle is indicated by drawing a small square in the angle, as shown in the image above. If one line is horizontal, the right angle is created by drawing a second line 90 degrees away from it. The two lines are perfectly perpendicular to each other. Imagine the corner of a book or the corner of a square or rectangular table. If you don’t have a protractor on hand, you may download a printable protractor from this page as well.We have created different kinds of protractors - the traditional semi-circle 180° protractor or the full circle 360° protractor, both available in black and white or colored.Ī right angle is exactly 90 degrees. Some of the worksheets have the base angle rotated slightly which requires more spatial thinking, and the other set of worksheets require students to measure reflex angles, read the hands of a clock, draw angles and more! All of these PDF worksheets include answer keys.Įach worksheet in this section provide great practice for measuring angles with a protractor. In later worksheets in the set, students measure angles with a protractor and supply the measurements as answers to the problems. The worksheets start out with the base leg of the angle always laying horizontal, which is the easiest way to visualize whether the angle is right, acute, or obtuse. The protractor worksheets and blank printable projectors on this page require students to measure angles and identify whether they are right, acute or obtuse. ![]()
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