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Earn +20 ptsQ: Triangles with all angles less than 90 degrees?
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What do equilateral triangles and acute triangles have in common?
All their angles are less than 90 degrees.
What triangle has less than 90 degrees?
Triangles, by definition, have 180 degrees. Angles that are less than 90 degrees are said to be acute.
Which triangles are acute triangles?
An acute triangle has all three angles less than 90 degrees.
Are all acute triangles equilateral triangles?
No, but all equilateral triangles are acute. Acute: All angles of the triangle are less than 90 degrees. Equilateral: All angles of the triangle are 60 degrees.
What triangles are classified by their angles?
Acute triangles have all of their angles less than 90 degrees. Right triangles have one of their angles equal to 90 degrees. Obtuse triangles have one of their angles greater than 90 degrees. Also, the 45-45-90 triangle and 30-60-90 triangle are useful when trying to get exact answers in trigonometry.
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