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27-12-2016
Mathematics

Answered

With reference to the diagram, what is cosA?

A.0.250

B.0.447

C.0.558

D.0.894

E1

With reference to the diagram, what is cosA? A.0.250 B.0.447 C.0.558 D.0.894 E. 1 class=

Verified Answer :

Anonymous Anonymous

27-12-2016

cos A = Ad / AB
tan 26.57 = AB / 17.89
so AB = 17.89 * tan 26.57 = 8.9469
By pythagoras
Bd = sqrt ( 17.89^2 - 16^2) = 8
AD = sqrt (8.9469^2 - 8^2) = 4.006

cos A = 4.006/ 8.9469 = 0.447

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SenpaiTrill SenpaiTrill

27-12-2016

Hello there.

With reference to the diagram, what is cosA?

B.0.447

Answer Link

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