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Unit 1 Study Guide I. Name _________________________ Know these vocabulary words. line – a straight path that goes on and on in both directions line segment – a straight path that has two endpoints ray – a straight path that has one endpoint and goes on and on in the other direction angle – two rays or two line segments that have the same endpoint (vertex) polygon – a closed figure made up of line segments quadrangle – a four-sided polygon II. Be able to identify, draw, and label line segments, lines, and rays. Be able to draw and label parallel and intersecting line segments. A B => line segment AB… AB or BA => line CD… CD or DC C D => ray EF … EF E F parallel line segments intersecting line segments Try it: 1. Draw VW intersecting YZ. 2. Name the following figure in two ways. _________ S III. _________ T Be able to draw and identify quadrangles. A square has four sides of equal length and four right angles. A rhombus has four sides of equal length but no right angles. A rectangle has two pair of opposite sides the same length and four right angles. A parallelogram has two pair of opposite sides the same length and no right angles. A trapezoid has one pair of opposite parallel sides. Try it: Draw a quadrangle that has four sides of the same length but is not a square. What kind of quadrangle is that? ____________________________ What is another way to classify the polygon? _______________________ IV. Be able to identify properties of polygons. A polygon is made up of line segments; curved lines are not line segments. The sides of a polygon must form one closed path. The sides of a polygon must not cross. A polygon can have only one interior. The number of sides is the same as the number of angles and vertices. A polygon must have at least three sides. This is a polygon: This is NOT a polygon… because it has curved lines. This is a polygon: This is NOT a polygon… because it is an open figure. This is a polygon. This is NOT a polygon… because it has more than one interior. V. Practice mental math. =>Knowing your basic facts can help you add and subtract numbers mentally. Example: 5 + 7 = 12 50 + 70 = ?? Think: If 5 ones + 7 ones = 12 ones Then 5 tens + 7 tens = 12 tens (which equals 120) Example 2: 16-8 = 8 160 – 80 = ?? Think: If 16 ones – 8 ones is 8 ones, Then 16 tens – 8 tens is 8 tens (or 80) Solve these problems mentally. 1. 3 + 9 = _____ 2. 30 + 90 = ______ 3. 16 – 7 = _____ 4. 160 – 70 = ______