If it takes 42 minutes to do 1 section of homework, how many minutes will it take to do all 17 sections of homework for this cla
2 answers:
You might be interested in
Answer:
centre = (2, 4)
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
Given
x² + y² - 4x - 8y - 5 = 0
Rearrange the x/y terms together and add 5 to both sides
x² - 4x + y² - 8y = 5
Use the method of completing the square on both the x/y terms
add ( half the coefficient of the x/y terms )² to both sides
x² + 2(- 2)x + 4 + y² + 2(- 4)y + 16 = 5 + 4 + 16
(x - 2)² + (y - 4)² = 25 ← in standard form
with centre (2, 4) and r = = 5
We can see that window is in shape of rectangle. So the length of the required wood to frame window is equal to the perimeter of rectangle.
SO the length of rectangular window is
feet.
Width of the rectangular window is =
feet.
In general parameter of rectangle is =
So the parameter of window is =
So the required length of wood to frame window is = 28.834 feet
SO the length of rectangular window is
Width of the rectangular window is =
In general parameter of rectangle is =
So the parameter of window is =
So the required length of wood to frame window is = 28.834 feet