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What is the length of the altitude of the equilateral triangle below?30°613613a60" 90" 60"313 313O A. 3O B. 9O D. 3N3o E. 108o F. 81

What is the length of the altitude of the equilateral triangle below?30 613613a60 90 60 313 313O A. 3O B. 9O D. 3N3o E. 108o F. 81 class=

Verified Answer :

fzhran

The answer is B. 9
Use cosine rule. In this case, I am using SOH and the right triangle:
sin 60°= a ÷ 6 root 3
(6 root 3)(sin 60°)= a
a=9

ianbagherzadeh

Answer:

B)9

Step-by-step explanation:

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