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Warm-up Homework out on desks, ready to be checked Prepare a sheet for notes, with the heading: Triangles and Quadrilaterals VOICE LEVEL ZERO

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Triangles

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Triangle – a figure formed by three line segments that intersect only at their endpoints

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Pause for Polygon Family Tree Part 1

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Angle Measure in Triangles

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The sum of the measures of the angles in a triangle (any triangle) is 180 o.

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Angle Measure in Triangles The sum of the measures of the angles in a triangle (any triangle) is 180 o. To find a missing measure, you: –Add the 2 measures you have –Subtract the total from 180

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Examples P 264 (3-9)

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Quadrilaterals

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Quadrilateral – a polygon that has four sides and four angles

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Pause for Polygon Family Tree Part 2

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Angle Measure in Quadrilaterals

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The sum of the angle measures in a quadrilateral (any quadrilateral) is 360 o.

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Angle Measure in Quadrilaterals The sum of the angle measures in a quadrilateral (any quadrilateral) is 360 o. To find a missing measure, you: –Find the sum of the 3 measures you have –Subtract from 360

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Examples P 274 (4-9)

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What about other polygons?

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5 sides –

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What about other polygons? 5 sides – pentagon

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What about other polygons? 5 sides – pentagon 6 sides –

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What about other polygons? 5 sides – pentagon 6 sides – hexagon

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides –

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides –

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides –

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides –

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides – decagon

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides – decagon 11 sides –

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides – decagon 11 sides – undecagon

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides – decagon 11 sides – undecagon 12 sides –

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides – decagon 11 sides – undecagon 12 sides – dodecagon

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides – decagon 11 sides – undecagon 12 sides – dodecagon 13 sides -

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What about other polygons? 5 sides – pentagon 6 sides – hexagon 7 sides – heptagon 8 sides – octagon 9 sides – nonagon 10 sides – decagon 11 sides – undecagon 12 sides – dodecagon 13 sides - triskadecagon

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Homework P 264 (10-23) P 274 (10-23) Define: –acute triangle- Trapezoid –right triangle- Parallelogram –obtuse triangle- Rectangle –scalene triangle- Rhombus –isosceles triangle- Square –equilateral triangle (all the words that are highlighted on pp 262, 263, 272, and 273 - use your textbook’s glossary)

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