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Aya
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Hi, I need help with these questions
Given the endpoints of a diameter, write an equation for the circle.
a) (-3,5) and (1,3)
I tryed this
m= (x1+x2)/2, (y1+y2)/2
= (-3+1)/2 , (5+3)/2
= -2/2, 8/2
= (-1,4)
( x-h)^2 + (y-k)^2=r^2
(x+1)^2 + (y-4)^2=r^2
(1+1)^2 + (3-4)^2=r^2
(2)^2 + (-1)^2=r^2
5=r^2
so, (x+1)^2 + (y-4)^2 = 5
but, this answer in the back of the book is different so can someone tell me what to do?
and
1. how do you simplify root 50
2. is rise y and run x?
***
when a stone is dropped in a lake, circular waves or ripples are created. The enrey point of the stone marks the center of the circles. Suppose the radious increases at the reate of 20cm/s. write anequation for the outermost circle 2.5s after the stone hits the water.
20*2.5=50cm
X^2 + Y^2=50^2
X^2 + Y^2=2500
is that right?
Given the endpoints of a diameter, write an equation for the circle.
a) (-3,5) and (1,3)
I tryed this
m= (x1+x2)/2, (y1+y2)/2
= (-3+1)/2 , (5+3)/2
= -2/2, 8/2
= (-1,4)
( x-h)^2 + (y-k)^2=r^2
(x+1)^2 + (y-4)^2=r^2
(1+1)^2 + (3-4)^2=r^2
(2)^2 + (-1)^2=r^2
5=r^2
so, (x+1)^2 + (y-4)^2 = 5
but, this answer in the back of the book is different so can someone tell me what to do?
and
1. how do you simplify root 50
2. is rise y and run x?
***
when a stone is dropped in a lake, circular waves or ripples are created. The enrey point of the stone marks the center of the circles. Suppose the radious increases at the reate of 20cm/s. write anequation for the outermost circle 2.5s after the stone hits the water.
20*2.5=50cm
X^2 + Y^2=50^2
X^2 + Y^2=2500
is that right?
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