complementary angles
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right angled triangle
A trapazoid
An irregular pentagon can have 5 vertices and two right-angles.
Two consecutive integers whose sum is 19 is 10 & 9; 10+9 = 19.
A two-fold symmetry has a 360 degrees rotation. A three-fold rotational symmetry, on the other hand, has 120 degrees, and on a horizontal axis, a symmetry has 180 degrees.