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Tackling the terminology
Here are some strategies that you could use when teaching the terminology of geometry.

Compile a glossary of terms and symbols.
Initially do this as a whole class activity. Students should personalise their glossary, adding to it when misunderstanding is revealed.

Use the correct terminology when you are teaching.
This models correct use of language and places value on accurate and succinct communication.

Use a Frayer model.
This organisational tool first requires the student to define the term in their own words. Facts or characteristics of the concept/term are then added, including any abbreviations. Giving examples and nonexamples highlights any misunderstanding the student may have about the concept. You can access this Frayer model website to find out more. A blank Frayer model template is provided.

Teach the pronunciation of new words.
Practising saying the word aloud gives students the confidence to use the correct term when sharing their ideas in class discussion.