ray - A part of a line that starts at one point and goes on forever in one direction., protractor - A tool shaped like a half‑circle that helps you measure angles in degrees., inner scale - The smaller set of numbers on a protractor, usually closer to the center, used to measure some angles., outer scale - The larger set of numbers on a protractor, around the edge, used to measure the other angles., right angle - An angle that is exactly 90 degrees (it looks like the corner of a square)., obtuse angle - An angle that is bigger than 90 degrees , acute andle - An angle that is less than 90 degrees , endpoint - A point at the end of a line segment or ray. , line - A straight path that goes on forever in both directions., line segment - A straight path with two endpoints; it doesn’t go on forever., perpendicular lines - Two lines that cross to make right angles (90°)., parallel lines - Two lines that go in the same direction and never touch, no matter how far they extend., intersecting lines - Two lines that cross each other at any angle., degrees - The units we use to measure angles. A full circle is 360 degrees., straight angle - 180 degrees or a straight line,

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