What does ctr mean in relation to diamonds?

Which of these polygons has congruent diagonals but not perpendicular? What is a diameter of a 27.5 inch circumference? The area of a gym floor is 264 square yards the floor is 11 yards wide how long is the floor a253 b24 yards c11 yards d242 yards? How do you get the volume of a sphere if you only have the circumference? What triangle has angles of 71 degrees and 62 degrees? What is the perpendicular distance from the point 2 and 4 to the straight line equation of y equals 2x plus 10 showing key stages of work? Is it true or false that a field names can contain periods and exclamation points but not square brackets in access? Would third degree burns cover more than one third of the body? What is inside the bent pyramid? All angles in a triangle equal 60 degrees? What is the area directly below the roof line where windows are found called? Does a cane have rotational symmetry? What is the surface area of a sphere with a diameter of 14? How many square miles in 38 acres? What is the volume of a prism whose dimensions are 2 cm3 cm4 cm? Can pythagorean theorem be proved by 3D figure? When plotting in math is it the x axis first or the y axis? What do you call a slice of a circle? What is the purpose of shapes? Which feature is attained when a painting has both balance and symmetry among the different parts of the work?