Acorollary needs which of the following geometric terms to be proven true? a. inverse b. identity c. common notion d. theorem

Answer : theorem

Corollary are known as true statements using original statement or theorem.

Lets take an example of corollary

In a equilateral triangle the angles are always equal. In a equilateral triangle all sides are equal, so the angle opposite to the sides are also equal.

All the angles are equal so triangle is equi-angular  and all the sides are equal so it is equilateral triangle. So, Corollary are known as true statements using original statement or theorem.

If we have a theorem then the statement can be proved. The another term for theorem is Corollary.

mxb67

step-by-step explanation:

i believe the answer is the polygon, heptagon.