The way it is written, none of them.

The "a"s cancel out.
<h3>
Answer: Choice H) 2</h3>
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Explanation:
Recall that the pythagorean trig identity is 
If we were to isolate sine, then,

We don't have to worry about the plus minus because sine is positive when 0 < x < pi/2.
Through similar calculations,
Cosine is also positive in this quadrant.
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So,

Therefore,

is an identity as long as 0 < x < pi/2
Answer:

Step-by-step explanation:
Given



Required
Solve for A
Simply substitute 18 for b and 30 for h



Hence:
The area is
