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Evaluate sec 240Á without using a calculator by using ratios in a reference triangle.
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3 votes
Evaluate sec 240Á without using a calculator by using ratios in a reference triangle.

User SKeurentjes
by
8.3k points

2 Answers

4 votes
60=pi/3
cos 60 = 0.5
sec 240 = 1/ cos 240
cos 240 = cos (180+60)
cos (180+x) = -cos x
cos (180+x) = -cos x
so
cos 240 = -cos 60
= -0.5
sec 240 =1/ cos 240
= 1/(-0.5)
= -2
User Cygorger
by
8.1k points
6 votes
sec∅ = 1/cos∅
= 1/cos(240)
= 1/cos(180 + 60)
= 1/-cos(60)
= 1/(-1/2)
= -2
User Rock
by
8.1k points
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