Question

how is a triangle different fromm all other shapes

Answer 1

Answer:

it has three sides

A figure or shape is not considered a polygon if it has rounded sides or if its sides intersects at any place other than at the ends of each side. ... An equilateral triangle is a regular polygon. It has all the same sides and the same angles. An isosceles triangle has two equal sides and two equal angles.

Answer 2

A triangle that has two angles with the same measure also has two sides with the same length, and therefore it is an isosceles triangle. It follows that in a triangle where all angles have the same measure, all three sides have the same length, and such a triangle is therefore equilateral.

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