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Splash Screen
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Lesson Menu
Five-Minute Check (over Lesson 111) Main
Idea Key Concept Area of a Triangle Example
1 Find the Area of a Triangle Key Concept Area
of a Trapezoid Example 2 Find the Area of a
Trapezoid Example 3 Real-World Example
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Main Idea/Vocabulary

• Find the areas of triangles and trapezoids.

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KC 1
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Example 1
Find the Area of a Triangle
Find the area of the triangle below.
Estimate
A 14.4 Multiply.
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Example 1
Find the Area of a Triangle
Answer The area of the triangle is 14.4
square centimeters.
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Example 1
Find the area of the triangle to the right.
A. 10.5 ft2 B. 13.5 ft2 C. 21.75 ft2 D. 27 ft2

1. A
2. B
3. C
4. D

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KC 2
Interactive Lab Area of Trapezoids
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Example 2
Find the Area of a Trapezoid
Find the area of the trapezoid below.
The bases are 4 meters and 7.6 meters. The height
is 3 meters.
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Example 2
Find the Area of a Trapezoid
Replace h with 3, b1 with 4, and b2 with 7.6.
Answer The area of the trapezoid is 17.4 square
meters.
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Example 2
Find the area of the trapezoid to the right.
A. 26.5 cm2 B. 60.5 cm2 C. 61.5 cm2 D. 73.5 cm2

1. A
2. B
3. C
4. D

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Example 3
GEOGRAPHY The shape of the state of Montana
resembles a trapezoid. Find the approximate area
of Montana.
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Example 3
Replace h with 285, b1 with 542, and b2 with 479.
Answer The area of Montana is about 145,493
square miles.
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Example 3
PAINTING The diagram is of a canvas resembling a
trapezoid that will be painted. In order to
determine how much paint will be needed, estimate
the area of the canvas in square feet.
A. 75 ft2 B. 150 ft2 C. 300 ft2 D. 450 ft2

1. A
2. B
3. C
4. D

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End of the Lesson
End of the Lesson
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Resources
Five-Minute Check (over Lesson 111) Image
Bank Math Tools
Area of Trapezoids Drawing 3-D Figures Area of
Polygons
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Five Minute Check 1
(over Lesson 11-1)
Find the area of the parallelogram. Round to the
nearest tenth if necessary.
A. 209 in2 B. 198 in2 C. 99 in2 D. 60 in2

1. A
2. B
3. C
4. D

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Five Minute Check 2
(over Lesson 11-1)
Find the area of the parallelogram. Round to the
nearest tenth if necessary.
A. 19 yd2 B. 38 yd2 C. 42 yd2 D. 84 yd2

1. A
2. B
3. C
4. D

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Five Minute Check 3
(over Lesson 11-1)
Determine whether the following statement is true
or false. The height of a parallelogram is the
distance from the base to the opposite side.
A. true B. false

1. A
2. B

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Five Minute Check 4
(over Lesson 11-1)
What is the height of a parallelogram if the base
is 24 centimeters and the area is 744 square
centimeters?
A. 28 cm B. 32 cm C. 31 cm D. 30.5 cm

1. A
2. B
3. C
4. D

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End of Custom Shows