2--8÷-2-3--12÷-6×-2 evaluate

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

If chord ab is congruent to chord cd, then what must be true about ef and eg?

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)