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Recent Geometry Questions

80 degrees Monday January 21, 2019
Can anyone help me see why ACB is 80 degrees? I have tried playing with parallel lines and basic ideas of geometry and some similar triangles stuff. Any hint

Geometry help needed by guitar builder Sunday January 20, 2019
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trigonometry identities equation Sunday January 20, 2019
Hi I struggle with equation ((1+sin(2x)+cos(2x)) / (1+sin(2x)-cos(2x))) =Cot(x) tried lots of different identities for 2 houres and have no progres I had some more simple one explained on lecture

Unit Circle Trigonometry Quick Question Sunday January 20, 2019
This is just a simple question but I can’t find the solution to this problem online and our teacher never explaines this part: Find all possible values of the angle:

Unit Circle Trigonometry Sunday January 20, 2019
Let sin 20◦ = k. Express the following in terms of k. a) sin 340 b) cos 200 c) tan 160 d) cot 70 Been trying to solve this for a while, I have a math test