just part a please!

4. Consider the following lines in H : The semicircle L1 centered at 0 with radius 4 , the vertical line L2 with x-coordinate 4/2, and the vertical line L3 with x-coordinate 2. Draw a labeled picture of this. Use this page and the next two pages for workspace as needed. (a) (8 points) These three lines form a hyperbolic triangle with one ideal vertex ( at ). Label the finite vertices of by A and B (from left to right in H ) and give the complex number coordinates for each in your illustration. Then use the (cross ratio) distance formula to compute the distance AB in H 4. Consider the following lines in H : The semicircle L1 centered at 0 with radius 4 , the vertical line L2 with x-coordinate 4/2, and the vertical line L3 with x-coordinate 2. Draw a labeled picture of this. Use this page and the next two pages for workspace as needed. (a) (8 points) These three lines form a hyperbolic triangle with one ideal vertex ( at ). Label the finite vertices of by A and B (from left to right in H ) and give the complex number coordinates for each in your illustration. Then use the (cross ratio) distance formula to compute the distance AB in H