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Answer:
Triangle:
3 vertices and 3 side,
this is no diagonals,
Sum of the interior angeles is 180°
Step-by-step explanation:
Pentagon:
has 5 side and 5 vertices,
has 5 diagonals,
Sum of the interior angeles is 540°
Hexagon:
has 6 side and 6 vertices,
has 9 diagonals,
Sum of the interior angeles is 1080°