105 hope that helps and always have a great day!
Answer: OPTION D.
Step-by-step explanation:
Given the equilateral triangle shown in the figure, you need to find the value of the altitude "a".
In order to find the altitude, you can use the following Trigonometric Identity:

In this case you can identify that:

Therefore, you can substitute values into
:

Finally, you must solve for the altitude "a". Then, this is:

Notice that this result matches with the value shown in Option D.
This is very flase hope this helps did i redeem my self
Answer:
I think it's C.
Step-by-step explanation:
The figures are rotated but they still have the same shape, size, and length.