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Presentation transcript:

Splash Screen

Five-Minute Check (over Lesson 9–4) Main Idea and Vocabulary Key Concept: Angles of a Quadrilateral Example 1: Find a Missing Angle Measure Key Concept: Classifying Quadrilaterals Example 2: Classify Quadrilaterals Example 3: Find a Missing Angle Measure Lesson Menu

Classify quadrilaterals and find missing angle measures in quadrilaterals. parallelogram rhombus trapezoid rectangle square Main Idea/Vocabulary

KC

Find a Missing Angle Measure Find the value of x in the quadrilateral shown. Since the sum of the angle measures in a quadrilateral is 360°, x + 50 + 130 + 50 = 360. Example 1

Find a Missing Angle Measure x + 50 + 130 + n50 = 360 Write the equation. x + 230 = 360 Add 50, 130, and 50. THINK What measure added to 230 equals 360? 130 + 230 = 360 You know that 130 + 230 = 360. Answer: So, the value of x is 130. Example 1

Find the value of x in the quadrilateral shown. B. 80 C. 90 D. 110 A B C D Example 1

KC

Classify Quadrilaterals RUGS Classify the quadrilateral of each rug below. Answer: The first rug is a parallelogram. The second rug is a square. Example 2

Classify the quadrilateral at the right. A. rectangle B. square C. rhombus D. trapezoid A B C D Example 2

Find a Missing Angle Measure SHORT RESPONSE What is the value of x in the quadrilateral below? Read the Item You need to find the value of x. Solve the Item Since the sum of the angle measures in a quadrilateral is 360°, x + 90 + 90 + 73 = 360. Example 3

Find a Missing Angle Measure x + 90 + 90 + 73 = 360 Write the equation. x + 253 = 360 Add 90, 90, and 73. THINK What measure added to 253 equals 360? 107 + 253 = 360 You know that 107 + 253 = 360. Answer: The value of x is 107. Check 107 + 90 + 90 + 73 = 360  Example 3

What is the value of x in the quadrilateral below? C. 90 D. 95 A B C D Example 3

End of the Lesson End of the Lesson

Five-Minute Check (over Lesson 9–4) Image Bank Math Tools Estimating Angles Angles in Triangles Resources

Classify the triangle as acute, right, or obtuse. (over Lesson 9-4) Classify the triangle as acute, right, or obtuse. A. acute B. right C. obtuse A B C Five Minute Check 1

Classify the triangle as acute, right, or obtuse. (over Lesson 9-4) Classify the triangle as acute, right, or obtuse. A. acute B. right C. obtuse A B C Five Minute Check 2

Find the value of x in the triangle. (over Lesson 9-4) Find the value of x in the triangle. A. 25 B. 35 C. 45 D. 55 A B C D Five Minute Check 3

Find the value of x in the triangle. (over Lesson 9-4) Find the value of x in the triangle. A. 70 B. 75 C. 80 D. 95 A B C D Five Minute Check 4

(over Lesson 9-4) A triangle has sides measuring 6 centimeters, 6 centimeters, and 9 centimeters. Classify the triangle by its sides. A. scalene B. isosceles C. equilateral A B C Five Minute Check 5

(over Lesson 9-4) A triangle has angles measuring 38° and 70°. What is the measure of the triangle’s third angle? A. 12° B. 52° C. 72° D. 92° A B C D Five Minute Check 6

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