exam Maths Puzzle Numerical Ability

what is the equal measurement to form a 11-gon

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the problem states:

for which numbers x, 0<=x<2pi, are teh following functions NOT defined?

9. tan x

i dont understand
can you help
with step by step explaination?
Hi. I need some help with the following problem. Thanks

Use the given information to find the constant of proportionality.
S varies jointly as p and q. If p = 3 and q = 7, then S = -21.

k =