Stepping Stone 4: Measuring Segments and Angles

Standards Addressed:

G-CO.A.1: Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.

coordinate: The coordinate of a point is its distance and direction from the origin of a number line. The coordinates of a point on a coordinate plane are in the form (x, y), where x is the x-coordinate and y is the y-coordinate.
congruent segments: segments that have the same length
midpoint: A midpoint of a segment is the point that divides the segment into tow congruent segments
angle: an angle is formed by two rays with the same endpoint. The rays are the sides of the angle and the common endpoint is the vertex of the angle
acute angle: an angle whose measure is between 0 and 90 degrees
right angle: an angle whose measure is 90 degrees
obtuse angle: an angle whose measure is between 90 and 180 degrees
straight angle: an angle whose measure is 180 degrees
congruent angles: angles that have the same measure

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Measuring Segments and Angles

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Practice 1-3: Points, Lines, and Planes.pdf

When 15 is subtracted from the measure of an angle, the result is the measure of a right angle. What is the measure of the original angle?

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