Transcript Document

10-5 Trigonometry and Area
To find areas of regular polygons and
triangles using trigonometry
Using trigonometric functions, students will calculate the areas
of triangles and regular polygons accurately, efficiently, and to a
degree of precision appropriate to the situation.
10-4 Quiz
determine how well you understood today’s lesson.
and don’t know why!
• Record the number you get right on your portfolio
sheet 
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1. Find the area of the regular polygon. Give the answer to the nearest tenth.
pentagon with a side of 6 ft
A.
B.
C.
D.
49.5 ft2
61.9 ft2
123.9 ft2
12.4 ft2
Non-Response
Grid
2. Find the area of the regular polygon. Give the answer to the nearest tenth.
hexagon with a side of 6 in.
A.
B.
C.
D.
9 in2
31.2 in2
93.5 in2
187.1 in2
Non-Response
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3. Find the area of the regular polygon. Give the answer to the nearest tenth.
square with a radius of 13 ft
A.
B.
C.
D.
338 ft2
169 ft2
676 ft2
343 ft2
Non-Response
Grid
4. A park in a subdivision is triangular-shaped. Two adjacent
sides of the park are 581 feet and 540 feet. The angle
between the sides is 83 . To the nearest unit, find the area
of the park in square yards.
A.
B.
C.
D.
51,900 yd2
34,600 yd2
38,925 yd2
17,300 yd2
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5. Find the area of the triangle. Give the answer to the
nearest tenth. The drawing may not be to scale.
15 cm

A.
B.
C.
D.
126.9 cm2
63.4 cm2
23.1 cm2
185.5 cm2
9 cm
Non-Response
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ASSIGNMENT
•10-5 p.646-647
#6-36 even
Be sure to RATE your understanding of the
lesson 4-3-2-1-0 after you finish it AND give me
one complete sentence as to why you rated
yourself that way then summarize what the
lesson was about in a sentence or two.
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