What is the definition of decimal?? What is the definition of perimeter??
What is the definition of Estimating??
What is the definition of Decimal Number??

decimal:relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

perimeter:the continuous line forming the boundary of a closed geometric figure.

estimating:roughly calculate or judge the value, number, quantity, or extent of.

decimal number:decimal numeral system is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numeral system. The way of denoting numbers in the decimal system is often referred to as decimal notation

Step-by-step explanation:

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)