All triangles that are not right triangles.
Rectangle, octagon, hectagon, square...
a circle
An acute triangle.
A circle.
Circle, cone, cylinder, sphere and equilateral triangle for example.
130 and 50 degrees.
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.
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.