An isosceles triangle can be acute or obtuse, depending on the measure of its angles. The two equal sides are called the base of the triangle, and the third side is called the altitude. Isosceles triangle: An isosceles triangle is a triangle that has two sides with the same length.The other two angles of an obtuse triangle are both acute angles, which means that obtuse triangles are not acute triangles. Obtuse triangle: An obtuse triangle is a triangle that has one of its angles measuring more than 90 degrees.The other two angles of a right triangle are acute angles, which means that right triangles are also acute triangles. This angle is known as the right angle, and it is denoted by a small square symbol. Right triangle: A right triangle is a triangle that has one of its angles measuring exactly 90 degrees.Acute triangle: An acute triangle is a triangle that has all three of its interior angles measuring less than 90 degrees.Acute angle: An acute angle is an angle that measures less than 90 degrees.Triangle: A triangle is a three-sided polygon with three straight sides.These triangles are known for their sharp, pointed appearance, and they have a number of important properties and characteristics that make them unique among the different types of triangles. In other words, all three angles of an acute triangle are acute angles. Acute triangles are a type of triangle that have all three of their interior angles measuring less than 90 degrees.
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