Consider a circle whose size can vary. Let r r represent the radius of the circle (in cm) and let C C represent the circumferenc
2 answers:
Answer:
Step-by-step explanation:
The formula for circumference of a circle is
where,
C represent the circumference of the circle.
r represent the radius of the circle.
It is the function f determines the circumference of the circle in cm, C C, given its radius length in cm, r.
So, the circumference of the circle is defined by the function
Therefore the required formula for function f is .
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The given equation is:
To find the line perpendicular to it, we interchange coefficients and switch the signs of one coefficient.
The equation to a line perpendicular to it is:
$ 2y-x=c$
where, $c$ is some constant we have determine using the condition given.
It passes through $(2,-1)$
Put the point in our equation:
$2(-1)-(2)=c$
$c=-2-2$
$c=-4$
The final equation is:
$\boxed{ 2y-x=-4}$
Coterminal angles are found by adding/subtracting 2
or 360, so D.