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# 10.4 notes

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### 10.4 notes

1. 1. Basic Geometry Unit 10.4 – Quadrilaterals
2. 2. Quadrilaterals <ul><li>A quadrilateral is a closed figure formed by four line segments that intersect only at their endpoints. </li></ul><ul><li>The sum of the measures of the angles of a quadrilateral is 360°. </li></ul>C A B D
3. 3. <ul><li>The measures of three angles of a quadrilateral are 87°, 103°, and 52°. What is the measure of the fourth angle? </li></ul>
4. 4. <ul><li>Area of Rectangle: A = l ∙ w </li></ul><ul><li>Perimeter of Rectangle: P = 2( l + w ) </li></ul>
5. 5. Types of Quadrilaterals Quadrilateral Might not have any parallel sides Trapezoid Quadrilateral with exactly one pair of parallel sides Parallelogram Quadrilateral with exactly two pairs of parallel sides Rectangle Parallelogram with 4 congruent angles Rhombus Parallelogram with 4 congruent sides Square Parallelogram with 4 congruent angles and 4 congruent sides
6. 6. Questions? <ul><li>Homework </li></ul><ul><ul><li>10.4 pg 515 #3-40 </li></ul></ul>