carterob001
carterob001 carterob001
  • 27-05-2017
  • Mathematics
contestada

The cosine of the complimentary angle to 57° a. 0.98 c. -0.01 b. 0.13 d. 0.84

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PHDFlopper
PHDFlopper PHDFlopper
  • 27-05-2017
Complementary angles: angles whose measures add up to 90 degrees.
x+57=90
x=33 degrees

cosine(33) = 0.83867056794542
0.83867056794542 rounded to the nearest hundredth is 0.84

The correct answer is D) 0.84
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irspow
irspow irspow
  • 27-05-2017
Since these are complementary angles (both summing to 90°)

This is equal to sin57° which is approximately:

sin57≈0.838 or 0.84 to nearest hundredth...

(because sinα=cos(90-α))


Answer Link

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