What type of triangle has all angles less than 90 degrees? - acute triangle, If one angle in a triangle is a right angle (90 degrees), what type of triangle is it? - Right triangle, What do we call a triangle with two sides of equal length? - isosceles triangle., In a scalene triangle, what can you say about the lengths of its sides? - All three sides have different lengths., How many sides does an equilateral triangle have? - All three sides are have equal lengths.,

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