It has 3 interior angles that add up to 180 degrees
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It has 10 interior angles that add up to 1440 degrees
A nonagon has 9 interior angles that add up to 1260 degrees
A congruent triangle has three sides, just like any other triangle. The term "congruent" in this context means that the lengths of the sides of the triangle are equal to each other. So, regardless of whether a triangle is congruent or not, it will always have three sides.
A plane is a straight line. An angls is formed by 2 intersecting lines.
There are 3 angles in a triangle.