4.7 Angles and Angle Measurement

Unit Goals

• Students learn to draw and identify points, rays, segments, angles, and lines, including parallel and perpendicular lines. Students also learn how to use a protractor to measure angles and draw angles of given measurements, and identify acute, obtuse, right, and straight angles in two-dimensional figures.

Section A Goals

• Draw and identify points, lines, rays, segments, and parallel and intersecting lines in geometric figures.
• Recognize that angles are formed wherever two rays share a common endpoint and identify angles in two-dimensional figures.

Section B Goals

• Recognize that angles can be measured in degrees, and can be found using addition and subtraction.
• Use a protractor to measure and draw angles, and recognize that perpendicular lines meet or cross at a right angle.

Section C Goals

• Draw and identify acute, obtuse, right, and straight angles in two-dimensional figures.
• Write equations to represent angle relationships and reason about and find unknown measurements.

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