Answer:
Third option.
Step-by-step explanation:
You need to remember that the formula used to calculate the arc lenght is:

Where "r" is the radius and "C" is the central angle in radians.
You need to solve for "C":
You know the radius and the arc lenght, therefore, you can substitute values to calculate the central angle in radians. Therefore, this is:

Lines of symmetry if the triangle is isosceles.
4, 2, 1
Answer:
Move 6.2 units up
Step-by-step explanation:
(-5.4, 6.2)
The first coordinate is the x coordinate
Positive x moves to the right, negative x moves to the left
Move 5.4 units to the left
The second coordinate is the y coordinate
Positive y moves to up, negative y moves down
Move 6.2 units up