Two () angles are equal to a circumference. Four () angles are equal to a circumference. Two () angles are equal to a flat angle. Arrange acute angles and circumference from small to large

Two () angles are equal to a circumference. Four () angles are equal to a circumference. Two () angles are equal to a flat angle. Arrange acute angles and circumference from small to large

Two (horizontal) angles are equal to a circumference. Four (straight) angles are equal to a circumference. Two (straight) angles are equal to a flat angle. From small to large, the acute angle, right angle, obtuse angle, flat angle and circumference are arranged