The definition of a circle uses the undefined term

Step-by-step explanation:

A Circle can be defined as a rounded figure with an angular degree of 360° and no sides. In which every point on its surface is at an equal distance from the center of the figure. Also, since its closed figure is ultimately curved it keeps its properties during movement. A Circle can also be described as a set of various points equally separated and with a same length from their shared origin.

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he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

whatare you sayig

step-by-step explanation: