splash screen. lesson menu five-minute check (over lesson 9–4) main idea and vocabulary key...
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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
• Classify quadrilaterals and find missing angle measures in quadrilaterals.
• quadrilateral
• rectangle• square
• parallelogram• rhombus• trapezoid
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.
Find a Missing Angle Measure
130 + 230 = 360 You know that 130 + 230 = 360.
Answer: So, the value of x is 130.
x + 50 + 130 + n50 = 360 Write the equation.
x + 230 = 360 Add 50, 130, and 50.
THINK What measureadded to 230 equals
360?
1. A
2. B
3. C
4. D0% 0%0%0%
A. 70
B. 80
C. 90
D. 110
Find the value of x in the quadrilateral shown.
RUGS Classify the quadrilateral of each rug below.
Answer: The first rug is a parallelogram. The second rug is a square.
Classify Quadrilaterals
1. A
2. B
3. C
4. D0% 0%0%0%
A. rectangle
B. square
C. rhombus
D. trapezoid
Classify the quadrilateral at the right.
SHORT RESPONSE What is the value of x in the quadrilateral below?
Find a Missing Angle Measure
Read the ItemYou need to find the value of x.
Solve the ItemSince the sum of the angle measures in a quadrilateral is 360°, x + 90 + 90 + 73 = 360.
Answer: The value of x is 107.
x + 253 = 360 Add 90, 90, and 73.
THINK What measureadded to 253 equals
360?
107 + 253 = 360 You know that 107 + 253 = 360.
x + 90 + 90 + 73 = 360 Write the equation.
Check 107 + 90 + 90 + 73 = 360
Find a Missing Angle Measure
1. A
2. B
3. C
4. D0% 0%0%0%
A. 60
B. 80
C. 90
D. 95
What is the value of x in the quadrilateral below?
Five-Minute Check (over Lesson 9–4)
Image Bank
Math Tools
Estimating Angles
Angles in Triangles
1. A
2. B
3. C
0% 0%0%
A. acute
B. right
C. obtuse
Classify the triangle as acute, right, or obtuse.
(over Lesson 9-4)
1. A
2. B
3. C0% 0%0%
A. acute
B. right
C. obtuse
Classify the triangle as acute, right, or obtuse.
(over Lesson 9-4)
1. A
2. B
3. C
4. D0% 0%0%0%
A. 25
B. 35
C. 45
D. 55
Find the value of x in the triangle.
(over Lesson 9-4)
1. A
2. B
3. C
4. D
0% 0%0%0%
A. 70
B. 75
C. 80
D. 95
Find the value of x in the triangle.
(over Lesson 9-4)
1. A
2. B
3. C0% 0%0%
A. scalene
B. isosceles
C. equilateral
A triangle has sides measuring 6 centimeters, 6 centimeters, and 9 centimeters. Classify the triangle by its sides.
(over Lesson 9-4)
1. A
2. B
3. C
4. D0% 0%0%0%
A. 12°
B. 52°
C. 72°
D. 92°
A triangle has angles measuring 38° and 70°. What is the measure of the triangle’s third angle?
(over Lesson 9-4)
