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Who among the following mathematicians is considered the founder of trigonometry?

          a. Euclid                b. Hipparchus        c. Aristotle                       d. Menelaus

The Almagest, which exerted a profound influence on astronomy and trigonometry, is a work of___

What is the name for angles that are between 90 and 180 degrees?

The union of two non-collinear rays with some common endpoint is called

In an angle, the common endpoint is called___

What do all the angles inside a triangle add up to?

Four angles are measured in degrees. Which of these is not an obtuse angle?

Classify the given triangle below by its angles and by its sides.

Supplementary angles are two angles whose measures have sum ____.

    Complementary angles are two angles whose measures have sum ____.

An angle measures 140°. What is the measure of its supplementary angle?