An obtuse angle is an angle greater than a right angle.
Father of geometry
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Cross Reference
2 sources
"A plane surface is a surface which lies evenly with the straight lines on itself."
Shocking"A prime number is that which is measured by a unit alone."
Strange & Unusual"Of trilateral figures, an equilateral triangle is that which has its three sides equal, an isosceles triangle that which has only two of its sides equal, and a scalene triangle that which has its thre…"
Shocking"The square on the side subtending the right angle in right-angled triangles is equal to the squares on the sides containing the right angle."
Shocking"A boundary is that which is an extremity of anything."
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