Which of the following is an undefined term?
a. angle b. circle c. plane d. ray

The undefined term is C.) Plane.  In geometry, the three undefined terms are point, line, and plane.  Defined terms, such as angle or circle, can be defined based on the combination of undefined terms.

Hope the explanation helped!

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?