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Does a pyramid have triangular faces?
It depends on the shape of the base, but yes it has at least 3 triangular faces!(yes)
An equilateral triangle is a special case of a isosceles triangle?
Yes - if you define an equilateral triangle as one in which at least two sides are equal.
How many triangles have at least two equal sides?
equilateral triangles and isosceles ones
Can a polygon be equilateral and equiangular but not convex?
No. A non-convex polygon must have at least one reflex angle (between 180 and 360 degrees). But by equiangularity, all the angles of the polygon would have to be reflex. On a plane surface this is not possible.
Is an equilateral triangle equal to an isosceles triangle?
An isosceles triangle has at least two congruent sides. An equilateral triangle has three congruent sides. So, an equilateral triangle is a special case of isosceles triangles. Since the equilateral triangle has three congruent sides, it satisfies the conditions of isosceles triangle. So, equilateral triangles are always isosceles triangles. Source: www.icoachmath.com
