How to do this cause I am confused
1 answer:
The answer is: " 268.666 in² " .
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Explanation:
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Formula for area of circle (shape of pizza):
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A =
* r² ;
in which: "A = area of the pizza (area of a circle)" ; for which we are to solve.
"" = 3.14 (approximation we shall use) ;
r = radius = "d/2" ; d = diameter = 18.5 in (given) ;
r = d/2 = (18.5 in. / 2) = 9.25 in.
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Plug our known values into the formula to solve for "A" (area):
A = * r² ;
= (3.14) * (9.25 in)² ;
= (3.14) * (9.25)² * (in²) ;
= (3.14) * (85.5625) * (in²) ;
= 268.66625 in² ;
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Round to: " 268.666 in² " .
_________________________________________
______________________________________________________
Explanation:
_____________________________________________________
Formula for area of circle (shape of pizza):
______________________________________________________
A =
in which: "A = area of the pizza (area of a circle)" ; for which we are to solve.
"
r = radius = "d/2" ; d = diameter = 18.5 in (given) ;
r = d/2 = (18.5 in. / 2) = 9.25 in.
_______________________________________________
Plug our known values into the formula to solve for "A" (area):
A =
= (3.14) * (9.25 in)² ;
= (3.14) * (9.25)² * (in²) ;
= (3.14) * (85.5625) * (in²) ;
= 268.66625 in² ;
_________________________________________
Round to: " 268.666 in² " .
_________________________________________
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Answer:
The coordinates of the center of this circle are (-5 , -3)
Step-by-step explanation:
* Lets explain how to solve the problem
- The mid-point of the segment whose endpoints are (x1 , y1) , (x2 , y2)
is
- AB is the diameter of circle T
∵ The diameter must passing through the center of the circle
∵ The center of the circle is the mid-point of all diameters of the circle
∵ The center of the circle is point T
∴ T is the mid point of the diameter AB
- Lets calculate the coordinates of point T by using the rule above
∵ A = (-9 , -1) and B = (-1 , -5)
∵ T is the mid-point of AB
- Let A = (x1 , y1) , B = (x2 , y2) and T = (x , y)
∴ x1 = -9 , x2 = -1 and y1 = -1 , y2 = -5
∴
∴
∴ The coordinates of point T are (-5 , -3)
* The coordinates of the center of this circle are (-5 , -3)