Warm-Up Exercises. Find the value of x. 1. ANSWER 65 ANSWER 120
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1 Warm-Up Exercises Find the value of x
2 Warm-Up Exercises Find the value of x
3 EXAMPLE Warm-Up 1Exercises Identify quadrilaterals Quadrilateral ABCD has at least one pair of opposite angles congruent. What types of quadrilaterals meet this condition? SOLUTION There are many possibilities.
4 EXAMPLE Warm-Up 2Exercises Standardized Test Practice SOLUTION The diagram shows AE CE and BE DE. So, the diagonals bisect each other. By Theorem 8.10, ABCD is a parallelogram.
5 EXAMPLE Warm-Up 2Exercises Standardized Test Practice Rectangles, rhombuses and squares are also parallelograms. However, there is no information given about the side lengths or angle measures of ABCD. So, you cannot determine whether it is a rectangle, a rhombus, or a square. The correct answer is A.
6 EXAMPLE Warm-Up 3Exercises Identify a quadrilateral Is enough information given in the diagram to show that quadrilateral PQRS is an isosceles trapezoid? Explain. SOLUTION STEP 1 Show that PQRS is a trapezoid. R and S are supplementary, but P and S are not. So, PS QR, but PQ is not parallel to SR. By definition, PQRS is a trapezoid.
7 EXAMPLE Warm-Up 3Exercises Identify a quadrilateral STEP 2 Show that trapezoid PQRS is isosceles. P and S are a pair of congruent base angles. So, PQRS is an isosceles trapezoid by Theorem Yes, the diagram is sufficient to show that PQRS is an isosceles trapezoid.
8 Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2, and 3 1. Quadrilateral DEFG has at least one pair of opposite sides congruent. What types of quadrilaterals meet this condition? Parallelogram, Rectangle, Square, Rhombus, Trapezoid.
9 Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2, and 3 Give the most specific name for the quadrilateral. Explain your reasoning. Kite: there are two pairs of consecutive congruent sides.
10 Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2, and 3 Give the most specific name for the quadrilateral. Explain your reasoning. Trapezoid: there is one pair of parallel sides, and because the diagonals do not bisect each other, it is not a parallelogram.
11 Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2, and 3 Give the most specific name for the quadrilateral. Explain your reasoning. Quadrilateral; there is not enough information to be more specific.
12 Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2, and 3 5. Error Analysis: A student knows the following information about quadrilateral MNPQ: MN PQ, MP NQ, and P Q. The student concludes that MNPQ is an isosceles trapezoid. Explain why the student cannot make this conclusion. It s possible that MNPQ could be a rectangle or a square since you don t know the relationship between MQ and NP.
13 Daily Warm-Up Homework Exercises Quiz Write true or false. 1. The diagonals of a rectangle are perpendicular. False 2. The diagonals of a rhombus are congruent. False 3. One pair of opposite angles of a kite are congruent. True
14 Daily Warm-Up Homework Exercises Quiz 4. Give the most specific name for the quadrilateral. Explain. Rhombus ; It is a since two pairs of opp. are. s = Since two consec. sides are, all sides are. = =
15 Daily Warm-Up Homework Exercises Quiz 5. Points A(1, 4), B(6, 1), C(1, 6), D( 4, 1) are the vertices of a quadrilateral. Give the most specific name for ABCD. Explain. Square; slope of AB = slope of CD = 1, slope of BC = slope of AD = 1. Opp. sides are, so ABCD is a. Two consec. sides are and AB = BC = 5 2, so ABCD is a square.
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