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Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect...

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Page 1: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.
Page 2: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

Main Idea and New Vocabulary

NGSSS

Example 1: Use Shadow Reckoning

Example 2: Use Indirect Measurement

Five-Minute Check

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Page 3: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

• Solve problems involving similar triangles.

• indirect measurement

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http://www.glencoe.com/apps/eGlossary612/grade.php
Page 4: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

MA.8.G.2.1 Use similar triangles to solve problems that include height and distances.

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Page 5: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

Use Shadow Reckoning

FLAGPOLES A flagpole near a city parking area casts a 22-foot shadow. At the same time, a 3.5-foot-tall parking meter casts a 2-foot shadow. How tall is the flagpole?

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Page 6: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

Use Shadow Reckoning

Answer: The flagpole is 38.5 feet tall.

Shadow Height

flagpoleparking meter

flagpoleparking meter

22 • 3.5 = 2 • h Find the cross products.

77 = 2h Multiply.

Divide each side by 2.

38.5 = h

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Page 7: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

A. 6 feet

B. 12 feet

C. 14.8 feet

D. 23.52 feet

SWINGS At the same time a 5-foot tall fence casts a 7-foot shadow, a nearby swingset casts a 16.8 shadow. How tall is the swingset?

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Page 8: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

LAKES The two triangles shown in the figure are similar. Find the distance across the lake.

Use Indirect Measurement

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Page 9: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

Write a proportion using the corresponding sides.

10 • 5 = (10 + d) • 2 Find the cross products.

50 = 20 + 2d Multiply. Subtract 20 from each side.

Use Indirect Measurement

Then divide each side by 2.

15 = d

Answer: The distance across the lake is 15 meters.

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Page 10: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

A. 12 feet

B. 27 feet

C. 30 feet

D. 45 feet

LAKES The two triangles shown in the figure are similar. Find the distance across the lake.

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Page 11: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

A. 2.1 feet

B. 33.3 feet

C. 75 feet

D. 300 feet

At the same time a 4-foot fencepost casts a 6-foot shadow, a cellular tower casts a 50-foot shadow. How tall is the cellular tower to the nearest tenth foot?

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Page 12: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

A. 1.5 feet

B. 18 feet

C. 24 feet

D. 66.6 feet

If the man in the picture is 6 feet tall, how tall is the tree?

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Page 13: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

A. 80 centimeters

B. 100 centimeters

C. 110 centimeters

D. 100 centimeters

A mother and daughter are standing next to each other. The mother is 160 centimeters tall and has a shadow that is 100 centimeters long. The daughter’s shadow is 50 centimeters long. How tall is the daughter?

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Page 14: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.
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Page 15: Lesson Menu Main Idea and New Vocabulary NGSSS Example 1:Use Shadow Reckoning Example 2:Use Indirect Measurement Five-Minute Check.

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