3.14•3•3=28.26 so A=28.26
Answer:
Solution : Option D
Step-by-step explanation:
The first thing we want to do here is isolate the cos(t) and sin(t) for both the equations --- ( 1 )
x = 5cos(t) ⇒ x / 5 = cos(t)
y = 2sin(t) ⇒ y / 2 = sin(t)
Let's square both equations now. Remember that cos²t + sin²t = 1. Therefore, we can now add both equations after squaring them --- ( 2 )
( x / 5 )² = cos²(t)
+ ( y / 2 )² = sin²(t)
_____________
x² / 25 + y² / 4 = 1
Remember that addition indicates that the conic will be an ellipse. Therefore your solution is option d.
the answer for this problem is true
Step-by-step explanation:
true 5-3=2
Hello,
Answer A
B: x²+y²-8x-8y+32=0==>(x-4)²+(y-4)²=0 is a point, not a circle.
C:x²+y²-4x-y+23=0==>(x+2)²+(y-2)²=-15 is not a circle
D: x²+y²+4x+4y+9=0==>(x+2)²+(y+2)²=-1 is not a circle.
But;x²+y²-8x-8y+23=0==>(x-4)²+(y-4)=9 is a circle.
