Answer:
A
Explanation:
You must know the basics of Trigonometry to solve this.
First, you must know that

lies in the second quadrant, so sin is negative.
Next, since
pi/4, is the reference angle of 3 pi/4, this means that we can set up a right triangle with pi/4 as an angle, we get


So the answer is A
Mercury diameter is 3,030 miles compared to size of the continental United States. This makes it 2/5 the size of Earth.
Answer: (A) shows how variolation became more popular as it was proved helpful
noun
1.
a rounded mass projecting above a surface.
verb
1.
heap up into a rounded pile.