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NRICH: Diagonals

How many diagonals does a regular icosagon (20 sides) have?

Age 14 to 16
STEAM Topics Resource Audience Grade Level Tags
Math Topics
Geometry, Patterning & Sequencing
High School
9th Grade, 10th Grade, 11th Grade
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NRICH
NRICH (University of Cambridge)

NRICH provides thousands of free online mathematics resources for ages 3 to 18, covering all stages of early years, primary and secondary school education – completely free and available to all.

https://nrich.maths.org/
NRICH: Topics in Secondary Mathematics
NRICH (University of Cambridge)

Do you enjoy thought-provoking questions? If so, this is the place for you.

https://nrich.maths.org/9196

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