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1.three
2.three,three,three
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- Triangle has 6 elements.
- A triangle has three vertices, three sides,and three angles.
- All the points on the triangle as well as in the interior of the triangle form closed region.
- If one side of a triangle is produced, the exterior angle so formed is equal to the sum of the two interior angles.
- All the angles of equilateral triangle are 180°.
- A triangle has three medians and three altitudes.
- A median connects a vertex of a triangle to the midpoint of the opposite side.
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