A 180-degree angle means that there is no difference, which is fairly true for CRT and plasma screens. However, viewing angles differ between LCD and front and rear-projection screens. Horizontal ...

Image caption, ...and draw another diagonal line to join the points and mark the angles inside the triangle. Use the scissors to cut the triangle out. STEP 4: Place two of the triangles along the ...

Two complementary angles add up to 90 degrees (a right angle), while larger combinations called supplementary angles add up to 180 degrees (a straight line). The difference between complementary ...