1.2.2 Acute, obtuse and right angle
Introduction
Triangles with right angles are called right-angled triangles, symbolized as:
Triangles with 3 angles that are acute (below 90 degrees) are called acute triangles, symbolized as:
Triangles with 1 angle that is obtuse (larger than 90 degrees) are called obtuse triangles, symbolized as:
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