An equilateral triangle.
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They both have 3 sides but an isosceles triangle has two equal sides whereas an acute triangle with different acute angles has no equal sides and is said to be a scalene triangle, or an acute triangle with three equal acute angles (of 60° each) and three equal sides is called an equilateral triangle.
Any triangle that has three equals sides must have three acute angles and is equilateral.
a triangle=======================an equilateral triangle
An isosceles triange has 2 equal sides and 2 equal interior angles whereas an acute triangle has 3 unequal sides and 3 interior acute angles of different sizes
Equilateral: equal sides and angles(60 degrees) Isosceles: two equal sides and angles Scalene: no equal sides or angles right triangle: has a 90 degree angle in it obtuse triangle: has an obtuse angle in it acute triangle: is made up of all acute angles