What does 10K-DG on a ring mean?

What is a figure that has one straight line? 'what is the name of a 2d shape that looks like the letter L? What the measure of interior angle of an equiangular pentagon? Is a balloon an oval shape? What is the area of a square swimming pool 9 meters long? Pythagoras determined that the length of any side of a? What is the circumference of a circle when the radius is 7.6 cm? How many obtuse angles can a quadrilateral have? A radius is an angle that connects any point on the circle to the center of that circle? How do you find the perimeter and area of an irregular shape? What is the rough opening of a 2'8 door? How many sides does a regular polygon have if each exterior angle measures 30? A triangle with angles that measure 32 79 and 69? How many acres is in 15000 sq ft? How many square feet is a quarter of an acre? Vertices on cuboid? How many triangles exist with these measures 4 m 4 m 7 m? What are the four angles of a rectangle? What trapezoid can be subdivided into four congruent right triangles? Is it true your head and neck are the same width?