What is the value of sec 180°??? Trigonometry 2 Answers Koekeltje · Jacobi J. Jun 21, 2018 #sec(180°)=-1# Explanation: #sec(180°)=1/(cos(180°))=1/-1=-1# Answer link Jacobi J. Jun 21, 2018 #-1# Explanation: #secx# is defined as #1/cosx#, so we are essentially being asked to find #1/cos180# The coordinates of #180^@# on the unit circle are #(-1,0)#, where the #x#-coordinate is the cosine value. This means #cos180=-1#, which means #1/cos180=-1#, which means that #sec180=-1# Hope this helps! Answer link Related questions How do I determine the molecular shape of a molecule? What is the lewis structure for co2? What is the lewis structure for hcn? How is vsepr used to classify molecules? What are the units used for the ideal gas law? How does Charle's law relate to breathing? What is the ideal gas law constant? How do you calculate the ideal gas law constant? How do you find density in the ideal gas law? Does ideal gas law apply to liquids? Impact of this question 4340 views around the world You can reuse this answer Creative Commons License