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

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

•  Euclid       

• Hipparchus     

• Aristotle 

• Menelaus

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

• Pitiscus

• Ptolemy       

• Regiomontanus

• Rhaeticus

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

• right

• acute

• obtuse

• reflex

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

• angle

• degree

• radius

• vertex

In an angle, the common endpoint is called___

• vertex

• terminal

• initial side

• point of intersection

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

• 90 degrees

• 100 degrees 

• 180 degrees

• 360 degrees

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

• 90

• 134

• 165

• 179

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

• obtuse, scalene

• acute, scalene       

• right, scalene

• obtuse, isosceles   

Supplementary angles are two angles whose measures have sum ____.

    Complementary angles are two angles whose measures have sum ____.

• 90; 45

• 180; 360     

• 180; 90

• 90; 180       

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

• 40°

• 118°

• 140°

• 208°