Answer:
D
Step-by-step explanation:
a triangles angles have to add up to 180 degrees
p.s.I hope this helps
Answer: 
Step-by-step explanation:
By definition, an Isosceles triangle has two equal sides and its opposite angles are congruent.
Observe the figure attached, where the isosceles triangle is divided into two equal right triangles.
So, in this case you need to use the following Trigonometric Identity:

In this case, you can identify that:

Substituting values, and solving for "x", you get:

Therefore, the length of BC rounded to nearest tenth, is:

The answer is 0.0017. Do you not have a calculator?
Answer:
D
Step-by-step explanation:
literlay just count
If AB = 4 inches, AC would equal to 8 inches. The
correct answer between all the choices given is the last choice or letter D. I
am hoping that this answer has satisfied your query and it will be able to help
you in your endeavor, and if you would like, feel free to ask another question.