<u><em>Explanation:</em></u> A plane is defined using three points. The intersection between two planes is a line
<u>Now, we are given the planes:</u> <span>ACG and BCG </span> By observing the names of the two planes, we can note that the two points C and G are common. This means that line CG is present in both planes which means that the two planes intersect forming this line.
c. CG
<span>In the given problem, the
place ACG and plane BCG. These planes intersect at CG in which intersection is
either a point, line or curve that an entity or entities both possess or is in
contact with. In the plane we can understand that the common line for both plane
ACG and plane BCG is CG. Further examples can include, plane KTGX and plane KUYT,
in this case you can imagine a rectangular prism in which they both intersect
at line KT. </span>