What is the numerical meaning of deca?

How many bisecting diagonals does an octagon have? What type of graph shows the relative percents of the parts that make up a whole? How many square feet of flooring would you need for a 17x17 ft room? When is a triangle obtuse when lengths of sides are given? What is 25 percent 260? Which geometric term best describes the light that shines from a flashlight? What year IS roman numeral mcmxli? What is mixed form fraction? Who would you say 999 993 000? What is 15 percent 5000? What two numbers are greater than 1.6 and smaller than 2.45? What is the simplest form of 210 over 240? How many feet is 121 inches? What is the area of the square with sides of 5 inches? What are four things to include in a graph? How do you write 28 in roman numerals? What two consecutive integers have a sum of -29? What numbers multiplied together equal 121? 2a plus 5 equals 17 what is the value of a? What percent of couples make it to 55 years?