![]() ![]()
![]() Protractors are commonly circular or semi-circular and made of transparent plastic, so that they can be placed over shapes drawn on a piece of paper, letting you take a measurement of the angle.A protractor is the main instrument used to measure angles.Angles greater than 180° are called reflex angles. An angle of exactly 180° is said to be straight.An angle less than 90° is said to be acute, and one greater than 90° but less than 180° is obtuse.Two angles whose sum is 180° are called supplementary angles, while two angles whose sum is 90° are called complementary angles.Two or more angles on a straight line add up to 180°.A semi-circle or half-circle is therefore 180°, and a quarter-circle, or right-angle, is 90°. #Measuring angles with a protractor worksheet full#
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |