Step-by-step explanation:
The total surface area is 168 square units.
Answer:
7 times 10 equals 70
Step-by-step explanation:
70 divided by 7 equal 10 and 70 divided by 10 equal 7
You do what is asked for in the parentheses then multiply by the number outside of them.
We are given an equation:

This is an equation of a circle. General form of a circle equation is:

Where:
a = x coordinate of a center
b = y coordinate of a center
r = radius of a circle
Motion detector can detect person anywhere within a boundary. The greatest distance at which detector can detect is at the edge of a circle. That distance, between detector and edge of circle, is equal to radius.
From the equation we have:

The greatest distance at which person can be detected is 4ft.