Bobby and Kayla are collecting clothes for a clothing drive. Kayla collected 3/5 as many clothes as Bobby did. If Bobby collected 1/3 of a bag of clothes, how many bags of clothes did Kayla collect?

answer:

an angle is the intersection of two noncollinear rays at a common endpoint. the rays are called sides and the common endpoint is called the vertex.

this implies that the term angle is defined from the undefined term line.

for two dimension i.e., a plane which is a two dimensional figure with infinite length, infinite width and no height.

from the undefined term plane the term angle cannot be defined

therefore, the undefined term which is used to define the term an angle is line.