Answer:
see below
Step-by-step explanation:
given:
radius of a circle = 3cm
find:
1. diameter
2. radius
3. r²
1) diameter = twice the radius = 2 r = 2 (3) = 6 cm
2) radius = 3 cm
3) r² = 3² = 9 cm
Answer:

Steps :
1. Create an equation
If x-4=0 and y-10.4=0, then x - 4 = y - 10.4

2. Isolate variable X by adding 4 to both sides

3. (Optional) Check Answer by plugging given values into the equation

4 = 4 is a true statement
To find slope, find rise over run (change in y over change in x). In this case, 12/3= 4.
The points form a rhombus, so the total perimeter is 4 times the length of one side. The difference in coordinates G and H is ...
... H - G = (2.5-1, 4-6) = (1.5, -2)
Then the length of GH can be found from the Pythagorean theorem to be
... GH = √(1.5² + (-2)²) = √(2.25+4) = √6.25
... GH = 2.5
The perimeter is 4 times that, so is 4×2.5 = 10 units.