Eunice had trouble learning the formula for calculating the area of a circle, so she says it to herself over and over again while the teacher passes out the geometry test. Eunice is demonstrating

Maintenance rehearsal

Explanation:

Eunice is demonstrating the use of maintenance rehearsal.

Maintenance Rehearsal can be defined as the process of repeatedly saying or thinking about a piece of information. It helps the short term memory store informations and pass those informations into the long term memory.

Short term memory is able to hold information for about 20 seconds. However, one can increase this time by practicing the use of maintenance rehearsal.

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