What is the sum of the measures of the interior angles of a 13-sided polygon?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?