v_a

2. \text{ Zostrojte stred A_1\text{ strany }BC.

v_a = 7 (slider from 0.5 to 10, step 0.1)
t_a = 8 (slider from 0.5 to 10, step 0.1)
r = 5 (slider from 1 to 8, step 0.1)
A = (-5, -1)
K = (1, 4)
f = Ray(A, K)
c = Circle(A, v_a)
A_0 = Intersect(c, f, 1)
v_{2} = Segment(A, A_0)
a = OrthogonalLine(A_0, f)
text2: "1. \text{ Zostrojte výšku }AA_0;  \; \left|AA_0  \right|=" + (LaTeX[v_a]) + " ; \; a⟂AA_0. "