関連ワード:  what is obtuse and acute angles    what is obtuse acute and right angles    what is the difference between obtuse and acute angles    what shape has obtuse and acute angles    what shapes have obtuse and acute angles    what is mean by obtuse and acute angle    what is obtuse angle triangle and acute angle triangle    what is acute obtuse and reflex angles    what shape has both obtuse and acute angles    what is acute obtuse right and straight angles