Geometry 10-5 Trigonometry and Area
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by Matthew Richardson
| 22 Questions
Note from the author:
A complete formative lesson with embedded slideshow, mini lecture screencasts, checks for understanding, practice items, mixed review, and reflection. I create these assignments to supplement each lesson of Pearson's Common Core Edition Algebra 1, Algebra 2, and Geometry courses. See also mathquest.net and twitter.com/mathquestEDU.
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10 pts
Solve It! The pennant shown is in the shape of an isosceles triangle. The measure of the vertex angle is 20 degrees. What is the area of the pennant? Hint: Consider using right triangle trigonometry. Round to the nearest square inch and enter your response in this format: 981 square inches
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10 pts
Solve It! Explain how you found your answer to the previous item.
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10 pts
Problem 1 Got It?
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Problem 2 Got It? A tabletop has the shape of a regular decagon with a radius of 9.5 in. What is the area of the tabletop to the nearest square inch? Enter your response in this format: 981 square inches
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10 pts
Problem 2 Got It? Reasoning: Suppose the radius of a regular polygon is doubled. How does the area of the polygon change? Explain.
The area is doubled. The doubling of the radius indicates a doubling in the apothem and area as well.
The area is tripled. The doubling of the radius indicates a doubling in the apothem and area.
The area is quadrupled. The doubling of the radius indicates a doubling in the apothem and area.
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Problem 3 Got It?
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Error Analysis: Your classmate needs to find the area of a regular pentagon with 8-cm sides. To find the apothem, he sets up and solves a trigonometric ratio. What error did he make? Explain.
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Review Lesson 10-4: What is the scale factor of the smaller octagon to the larger octagon?



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10 pts
Review Lesson 10-4: The area of the larger octagon is 391.1 in². What is the area of the smaller octagon to the nearest square inch? Enter your response in this format: 39 square inches
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Review Lesson 8-5: Use the Law of Sines to find the value of x. Round to the nearest hundredth. Enter your response in this format: 21.30 m
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Review Lesson 8-5: Use the Law of Sines to find the value of y. Round to the nearest hundredth. Enter your response in this format: 21.30 m
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Review Lesson 1-8: Sort the items in ascending order (least on top) based on the value of the number that fills in each blank.
  1. A circle with radius 6 has diameter __?__.
  2. A circle with radius 7 has diameter __?__.
  3. A circle with diameter 15 has radius __?__.
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10 pts
Vocabulary Review: Fill in the blank to complete the sentence.

Area is the number of __?__ units needed to cover a given surface.
cubic
square
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10 pts
Vocabulary Review: What is the formula for the area of a triangle?
A = bh
A = ½bh
A = ½h(b₁ + b₂)
A = ½d₁d₂
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5 pts
Use Your Vocabulary: Write only the word trigonometry or trigonometric to complete the sentence. The sine, cosine, and tangent ratios are __?__ ratios.
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5 pts
Use Your Vocabulary: Write only the word trigonometry or trigonometric to complete the sentence. This year I am studying __?__ in math.
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10 pts
Use Your Vocabulary: Match each ratio of side lengths from a right triangle with the trigonometric ratio it represents.






  • cosine
  • sine
  • tangent
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10 pts
Reflection: Math Success
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