An equilateral triangle, which has 3 angles of 60o.
112.5 degrees
Supplementary angles are two angles whose measures add to 180 degrees. Adjacent angles are two angles that happen to lie next to each other, so that they combine to form a larger angle whose measure is the sum of the measures of the adjacent angles. Angles may be both adjacent and supplementary, in which case they will form a straight angle.
Complementary angles total 90 degrees so smaller is 90/5 ie 18 and larger 72.
120 (2/3 of 180)
Angles larger than a right angle and smaller than a straight angle (between 90° and 180°) are called obtuse angles ("obtuse" meaning "blunt"). An angle equal to 1. /. 2 turn (180° or π radians) is called a straight angle.
A circle.
An equilateral triangle, which has 3 angles of 60o.
Rectangle, octagon, hectagon, square...
All triangles that are not right triangles.
112.5 degrees
Supplementary angles are two angles whose measures add to 180 degrees. Adjacent angles are two angles that happen to lie next to each other, so that they combine to form a larger angle whose measure is the sum of the measures of the adjacent angles. Angles may be both adjacent and supplementary, in which case they will form a straight angle.
72
Complementary angles are angles that add up to 90 degrees. If the smaller angle is x, the larger is 5x, so 6x = 90. X equals 15, and the larger angle measures 75 degrees.
Complementary angles total 90 degrees so smaller is 90/5 ie 18 and larger 72.
120 (2/3 of 180)
Amongst polygonal shapes, only an acute triangle can have all its angles less than 90 degrees. Any other polygon must have one or more right or obtuse angles.