The exterior angle of an equilateral triangle is 180-60=120, and it’s obtuse. Isosceles triangles has two equal sides, and equilateral has all three sides equal. It means that all equilateral triangles are also isosceles, but not conversely. Equlateral triangles have all sides same length, so each side is perimeter divided by 3. \begin A) True B) True C) False D) False E) True Base angles are always acute. ![]() E) True The exterior angle of an equilateral triangle is 180-60=120, and it’s obtuse. Lines are well lines and do not have any endpoints. D) False Because we dont know the length of base. Threes a Triangle An isosceles obtuse triangle The acute angles of a right triangle are complementary. The goal of this task is to answer which set of shapes contains members that are always similar to one another: trapezoids, isosceles triangles, equilateral triangles, or rectangles pentagons. ![]() C) False Isosceles triangles has two equal sides, and equilateral has all three sides equal. It means that all equilateral triangles are also isosceles, but not conversely. Isosceles Triangle: A triangle in which any two sides are equal is an Isosceles triangle. The bisector of an angle of a triangle divides it into two similar triangles. Two isosceles right triangles are similar. B) True Equlateral triangles have all sides same length, so each side is perimeter divided by 3. In two triangles, if all 3 pairs of corresponding angles are proportional, then the triangles are similar.
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