Plot the points A(1,2), B(1,6), and C(5,5) on a Cartesian plane and draw triangle ABC.

The coordinates of the triangle ABC are given as:
A$(1,2)$
B$(1,6)$
C$(5,5)$

• To plot point A$(1,2)$, start at the origin $(0,0)$, move 1 unit to the right along the x-axis, then move 2 units up parallel to the y-axis. Mark this point as A.
• To plot point B$(1,6)$, start at the origin $(0,0)$, move 1 unit to the right along the x-axis, then move 6 units up parallel to the y-axis. Mark this point as B.
• To plot point C$(5,5)$, start at the origin $(0,0)$, move 5 units to the right along the x-axis, then move 5 units up parallel to the y-axis. Mark this point as C.

Connect the plotted points with straight lines:

• Draw a line segment from A to B.
• Draw a line segment from B to C.
• Draw a line segment from C to A. This forms triangle ABC.

The coordinates to plot are:
A$(1,2)$
B$(1,6)$
C$(5,5)$