If `180^@

Find the conjugate angles of 180^@

Construct angles of 180^@ , 240^@ , 300^@ .

If ABCD is a cyclic quadrilateral then co (180^(@) +A) + cos (180^(@) - B) +cos(180^(@)-C) - sin (90^(@) - D)=

sin 180^@=

An angle measuring 180^(@) is called

A right angle measures 180^(@)

Draw angle with measurements: 180^@ ,