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Unit 8: Geometry Learning Targets: • • • • • • • • • • • Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure using a protractor. Recognize angle measurements as additive when an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measure of the parts. Classify two-dimensional figures based on the presence or absence or parallel or perpendicular lines. Recognize and identify right triangles. Identify a line of symmetry for a two-dimensional figure. Draw lines of symmetry. Classify angles of a specified size. Apply area and perimeter formulas for rectangles in real world and mathematical problems. Unit 8 Vocabulary Term Point Definition Example Aexactposi.oninspace representbyadot. LineSegment Sec.onofalinebounded by2endpoints. Line Straightonedimensional figureofinfinitelength. Ray Alineofinfinitelength fromanendpointinone direc.on. Angle Amountofturning betweentwolines mee.ngatonepoint. Unit 8 Vocabulary Types of Angles RightAngle Anglemeasuring90 degrees. AcuteAngleAngle measuringlessthan 90degrees. ObtuseAngle Anglemeasuring greaterthan90 degreesandless than180degrees. Protractor StraightAngle Anglemeasuring 180degrees. Instrumentusedto measureangles. Unit 8 Vocabulary Term Definition Intersec.ng Lines Linesthatcrossoverone another. Parallel Lines Linesthatarethesame distanceapart.They neverintersect. Perpendicular Lines Linesthatform90degree angleswherethey intersect. Lineof Symmetry Dividesasymmetrical objectinhalfwithboth sidesbeingcongruent. 2-Dimensional Shape Shapewithlengthand width.Aflatshape. Example • • • • Polygons Straight sides Closed Figure 3 or more sides Sides do not intersect Triangle 3sidedpolygon Hexagon 6sidedpolygon Square/Rectangle 4sidedpolygon Heptagon 7sidedpolygon Rectangle 4sidedpolygon Octagon 8sidedpolygon Pentagon 5sidedpolygon Decagon 10sidedpolygon Unit 8 Vocabulary Term Definition RightTriangle Trianglewith1right angle. Obtuse Triangle Trianglewith1obtuse angle. Acute Triangle Trianglewith3acute angles. Equilateral Triangle Trianglewith3equal sidesand3equalangles. Scalene Triangle Trianglewithnoequal sides. Example Unit 8 Vocabulary Term Isosceles Triangle Definition Trianglewith2equal sides. Quadrilateral 4sidedpolygon Parallelogram Quadrilateralwith oppositesidescongruent andparallel. Square Parallelogramwith4 equalsidesand4right angles. Rectangle Parallelogramwith4right angles. Example Unit 8 Vocabulary Term Definition Rhombus Parallelogramwith4 equalsides. Trapezoid Quadrilateralwith1set ofparallelsides. 4in Example
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