Jessica needs to memorize words on a vocabulary list for Russian class. She has memorized 21 of the words, which is one-third of
the list. How many words are on the list?
2 answers:
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The angle between the two tangents drawn from an external point to a circle and the angle subtended by the line segment joining the points of the contact at the Centre are supplymentary,
So,
15.) let the unknown angle be x
=》x + 55° = 180°
=》x = 180° - 55°
=》
16. let the unknown angle be n
=》n + 80° = 180°
=》n = 180° - 80°
=》