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Download Geometry Section 1.4 - West End Public Schools
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Transcript
Geometry Section 1.4 Measure and classify Angles Terms • Angle consists of two different rays with the same endpoint vertex side • To name angles, either name with 3 points (point at the vertex in the middle), or name with the vertex point. •See mimio example • To measure use protractor •See mimio example Classifying angles • Acute angle measures more than 0 degrees, but less than 90 degrees • Right angle measures 90 degrees • Obtuse angle measures more than 90 degrees but less than 180 degrees • Straight angle measures 180 degrees Angle Addition Postulate • If P is in the interior of angle RST, then the measure of angle RST is equal to the sum of angle PST and angle RST •See mimio example Examples • Page 29 •Problems #23, 25 Terms • Two angles are congruent if they have the same measure • Angle bisector is a ray that divides an angle into two angles that are congruent Examples • Page 30 • Problem 41 Assignment • Section 1.4 • Page 28 • Problems # 4, 8 – 40 even, 56 - 60
