Answer:
The cosine of the angle is: negative
The sine of the angle is: positive
Step-by-step explanation:
The answer for the exercise is the third option, which is: Hexagon.
The explanation is shown below:
As you can see in the figure attached, the cross section is a polygon of six sides and six angles. Therefore, it has six vertexes. In geometry, this type of polygon is known as "Hexagon".
That is a 30 60 90 triangle.
Read about those here: http://www.1728.org/trig2.htm
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G in bass clef is the answer D!