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hartmaaj95
27.06.2019 •
Mathematics
The endpoints of a diameter of a circle are located at (5,9) and (11,17) which is an equation of the circle?
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Ответ:
(x - 8)² + (y - 13)² = 25
Step-by-step explanation:
The equation of a circle in standard form is
(x - h)² + (y - k)² = r²
where (h, k) are the coordinates of the centre and r is the radius
The centre is located at the midpoint of the endpoints of the diameter.
Use the midpoint formula to find the centre
[
,
]
with (x₁, y₁ ) = (5, 9) and (x₂, y₂ ) = (11,17)
centre = (
,
) = (8, 13)
The radius is the distance from the centre to either end of the diameter
Calculate r using the distance formula
r = √ (x₂ - x₁ )² + (y₂ - y₁ )²
with (x₁, y₁ ) = (8, 13) and (x₂, y₂ ) = (5, 9)
r =![\sqrt{(5-8)^2+(9-13)^2}](/tpl/images/0025/0389/182a8.png)
=![\sqrt{(-3)^2+(-4)^2}](/tpl/images/0025/0389/aed95.png)
=
=
= 5 ⇒ r² = 25
Hence
(x - 8)² + (y - 13)² = 25
Ответ:
Check the picture below.