Doing a test answer if u know about irrational numbers

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

If the value of cos330°is√3/2 then find cos 165°.

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?