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In your own post below, use the Draw tool to recreate this quadrilateral.Then, draw 1 line to split the quadrilateral into triangles.

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In your own post below, use the Draw tool to recreate this pentagon. Then, draw 2 lines to split the pentagon into triangles.

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In your own post below, use the Draw tool to recreate this hexagon. Then, draw 3 lines to split the hexagon into triangles.

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In your own post below, use the Draw tool to recreate this heptagon. Then, draw 4 lines to split the heptagon into triangles.

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How many triangles did you get? Using your knowledge that the interior angles of a triangle add up to 180°, what do the interior angles of a quadrilateral add up to?

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How many triangles did you get? Using your knowledge that the interior angles of a triangle add up to 180°, what do the interior angles of a pentagon add up to?

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How many triangles did you get? Using your knowledge that the interior angles of a triangle add up to 180°, what do the interior angles of a hexagon add up to?

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How many triangles did you get? Using your knowledge that the interior angles of a triangle add up to 180°, what do the interior angles of a heptagon add up to?

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In your own post below, use the Draw tool to recreate this octagon. Then, draw 5 lines to split the octagon into triangles.

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In your own post below, use the Draw tool to recreate this nonagon. Then, draw 6 lines to split the nonagon into triangles.

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In your own post below, use the Draw tool to recreate this decagon. Then, draw 7 lines to split the decagon into triangles.

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How many triangles did you get? Using your knowledge that the interior angles of a triangle add up to 180°, what do the interior angles of an octagon add up to?

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How many triangles did you get? Using your knowledge that the interior angles of a triangle add up to 180°, what do the interior angles of a nonagon add up to?

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How many triangles did you get? Using your knowledge that the interior angles of a triangle add up to 180°, what do the interior angles of a decagon add up to?