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-VOCABULARY -INTERSECTING LINES, PARELLEL LINES, AND TRANSVERSALS -ANGLES -TRIANGLES -CIRCLES -QUADRILATERALS -PYTHAGOREAN THEOREM LINES: PERPENDICULAR – a straight line that crosses another straight line to create a 90⁰ angle. PARALLEL – a straight line that runs along the same angle as another straight line and will never intersect TRANSVERSAL – a straight line that intersects two or more lines MIDPOINT – the point of a line segment that divides the line segment evenly in two equal parts ANGLES OPPOSITE ANGLES – non-adjacent angles that are formed by two intersecting lines ADJACENT ANGLES – angles that share a common vertex and a common arm VERTEX – a special kind of point that describes the corners or intersections of geometric shapes COMPLIMENTARY ANGLES – two angles that add up to 90 ⁰ RIGHT ANGLE – one angle that is 90 ⁰ ANGLES SUPPLEMENTARY ANGLES – two angles that add up to 180 ⁰ STRAIGHT ANGLE – one angle that is 180 ⁰ CORRESPONDING ANGLES – matching angles that are formed by transversal and two parallel lines CIRCLE – has exactly 360 ⁰ TRIANGLE – HAS EXACTLY 180 ⁰ A straight line = 180° (1 + 2) (1+4) Opposite angles are equal (1 = 3) (2 = 4) Perpendicular bisector = 90° 1 4 2 3 Parallel lines are the two lines that are at the same angle and same distance. They will never intersect. 1 3 Therefore, 8 if a line intersects with them they will have corresponding angles. (1 = 3 = 8) A straight line that intersects two or more lines. Like a street that intersects with other streets Creates 4 angles that altogether measure 360° or 2 x 180° straight lines Acute angle is less than < 90° Obtuse angle is greater than > 90° Right angle is exactly = 90° Acute Obtuse Right 3 sides – 3 angles = 180° 360° total (circumference) Radian = 2𝜋rad = 360: 180° = 1 radian Any four sided figure (ie. Square, rhombus, rectangle, trapezoid, parallelogram) Interior angles together add up to = 360° Specific to Right-Angle Triangles 3 sides = Hypotenuse, Adjacent, Opposite Hypotenuse = longest side opposite right angle c Adjacent/Opposite are interchangeable (called “legs”) Formula: a² + b² = c²