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Transcript
Geometry Teacher Key Angle Measures Measure each angle. Write its measurement in degrees and whether it is acute, right, obtuse, or straight. You will need a protractor to measure the angles. Measure Type of Angle A. 40° _________ acute ______________ B. 95°° _________ obtuse ______________ C. 80°° _________ acute ______________ D. 108°° _________ obtuse ______________ E. 90°° _________ right ______________ F. 180°° _________ straight ______________ © 2003 CompassLearning, Inc. Activity 67216 Geometry Teacher Key Angle Measures Name the type of angle that fits each description. G. This angle measurement is always equal to 90°. right ________________ H. An angle whose measurement, m, fits the statement, 0° < m < 90°. acute ________________ I. An angle whose measurement, x, fits the statement, 90° < x < 180°. obtuse ________________ J. This angle measure is always equal to 180°. straight _________________ Draw an angle for each measurement. K. 85º 125º L. 25º 115º © 2003 CompassLearning, Inc. Activity 67216 Geometry Teacher Key Connections Think About It Angles can be found all around us. Look around your home or your bedroom. Find three examples of acute angles, three examples of obtuse angles, and three examples of right angles. Describe and label each in the space provided. SAMPLE RESPONSE: The frames in a window, a CD case, and a book are all ________________________________________________________________________ examples of things with right angles. A coat hanger, a necklace chain hanging ________________________________________________________________________ around your neck, and a lampshade all have acute angles. Obtuse angles can be ________________________________________________________________________ found in a open book, an open cabinet door, and the angle of a kitchen spatula with ________________________________________________________________________ its handle. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ Right Angle Exploration Can a triangle have more than one right angle? Try drawing a triangle with one right angle, then two right angles, then three right angles. Explain why this can or cannot be done. A triangle with one right angle is possible. © 2003 CompassLearning, Inc. A shape with two right angles and three sides cannot be a triangle, because it cannot be a closed figure. A shape with three right angles must have at least 4 sides. Activity 67216
