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On a flat surface only a right angled triangle has one 90o angle (right angle.) The others angles total 90o but aren'r 90o in their own right. Once you move into other forms of geometry, such as triangles on the surface of the Earth, the number of right angles in a triangle can be 3. Example: Lines leaving the equator perpendicular to the equator can meet at the pole at 90o

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12y ago

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