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‘This lesson introduces supplementary angles and prepares students to figure angle sums of polygons.’
‘The supplementary angle of the interior angle, or the difference between the interior angle and 180°, is referred to as the ‘neighbour-avoidance index’.’
‘In this section, we are going to deal with vertical angles and supplementary angles in a different way.’
‘So, for example 60° is the measure of the complementary angle to 30° while 150° is the measure of the supplementary angle to 30°.’
‘It is a further object of this invention to measure an angle, its complementary angle and its supplementary angle simultaneously.’