NEED DISCORD HELP: HELLO someone please tell me why this black long box is showing up and look at pic

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.