Noel correctly adds the length of three sides of a rectangle and gets 88 cm her brother Ryan correctly adds the lengths of three sides of the same rectangle and gets 80cm. What is the number of cm in the perimeter of the rectangle. I was having this discussion with another teacher and we need a third opinion.
Tooth crowns. A tooth crown or dental crown is a tooth-shaped sleeve made of porcelain or metal or a combination of both that is placed over a tooth. The dentist will match it up to the shape and colour of your other teeth.
Some crowns are made entirely out of metal. The classic metallic crown is one made out of gold, or more precisely, a gold alloy. Actually, there are a number of different types of dental alloys that can be used for crown fabrication. Some of these metals are silver (white) in color, rather than yellow like gold. Dentists have been placing all-metal crowns for over 100 years, the longest of any type by far.