Triangles are 2d. Pyramids are 3d.
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the difference between a triangle and a trapozoid is that a triangle has 3 sides and corners and a trapozid has 4 sides and corners.Also a triangle is a triangle and a trapoizd is a quadrillateral.
A square pyramid has the base of a square,and sides of a triangle. While a triangle pyramid has the base and sides of a triangle.
An acute triangle has three interior acute angles An obtuse triangle has one obtuse and two acute interior angles
They are the same. If the sides of a triangle are all the same length, then its angles are all 60 degrees, and the reverse is also true.
A scalene triangle has 3 sides of different lengths An isosceles triangle has 2 sides of equal lengths An equilateral triangle has 3 sides of equal lengths