Answer:7.4
Explanation:
Φ=20°
AB=hypotenus
7=adjacent
CosΦ=adjacent ➗ hypotenus
Cos20=7 ➗ AB
0.9397=7 ➗ AB
Cross multiply
AB x 0.9397=7
Divide both sides by 0.9397
(AB x 0.9397)/0.9397=7/0.9397
AB=7.4
Answer:
AB ≈ 7.08
Cos θ = adjacent / hypotenuse
where θ = 20° , adjacent = 7 and hypotenuse = AB
cos 20 = 7 / AB
cos 20 × AB = 7
AB = 7/Cos 20
AB = 7 / 0.989
AB = 7.077
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