Who established the rules of spherical trigonometry?

Claudius Ptolemy

Which mammal emits a loud clicking noise to echolocate prey underwater What punk band did Billie Joe Armstrong help create? Who first finds out about Chandler liking Monica during Thanksgiving when she overheard a conversation? Rachel initially regrets buying a specific animal; what animal is it? What is the fictional setting of the Elder Scrolls III: Morrowind?