Because the sum of the sides of three triangles is nine... Placing three triangles together so they all touch effectively removes four of the total number of sides - leaving five.
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One star has five triangles on the sides, and about three in the middle, if enough lines are drawn.
Yes
Equilateral ( all sides are congruent), Isosceles (2 sides are congruent, Scalene (no sides are congruent), Acute ( three acute angles), Obtuse ( one obtuse angle), Right ( one right angle).
A triangular pyramid is a four sided 3D shape. All four sides are triangles. It resembles a 'traditional' pyramid, like the ones in Egypt. A triangular prism is a five sided 3D shape. It consists of two identical triangular sides connected by three identical rectangular sides. think of it as a cylinder with triangles on the ends and three sides instead of a smooth surface.
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