187 Answered Questions for the topic Circles

Circles

03/11/15

(X-3)^2 + 2y^2=8
I need help finding the center, radius and intercepts!
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02/12/15

Hard Geometry Problem
Two circles are tangent to two lines. The two circles have diameters 46 cm and 76 cm. The points of tangency are points A and B. Line segment AB measures 48 cm.How far are the centers of the two... more
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02/04/15

Which of the following is a sinusoid
Which of the following is a sinusoid?   A). x^2+y^2=1 B)x^2/3 + y^2/6=1 C). cuberoot(x)  D) y=cos(x)-2   I am thinking it's D....is that correct? Could someone explain what a sinusoid is?... more
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02/03/15

Trig question
Assume cos t = .45 and cos w = .89, both t and w are positive values between 0 and 2pi , and both t and w determine a terminal point in quadrant 4. Which of the following statements best describes... more
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Circles

02/01/15

the line x-2y+24=0 is a tangent to a circle at (0,12). the line y=2x+3 is tangent to the same circle at (3,9). find the center of the circle
please help me on this problem, i've been trying to solve it for an hour
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01/27/15

need help with limits and secants
The solutions (x,y) of the equation x^2 + 16y^2 = 16 form an ellipse circle Consider the point P ( in the positive x-yplane), with x-coordinate 1.a) Let h be a small non-zero number and form the... more
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01/07/15

Draw the unit circle with center (0,0)and plot the point P=(6,2). Observe there are TWO lines tangent to the circle passing through the point P.
1)the tangent line on top of the circle(L1) has coordinates? a) what is the equation for L1?2) the tangent line below the circle(L2) has coordinates?b)what is the equation for L2?I have the... more
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01/04/15

A circle has the equation x2+y2-8x+14y+40=0. Express this equation in center-radius form.
Homework problem I can't figure out, there's two of these problems they're very similar but if someone can explain it to me step by step I think I can figure out the second one on my... more
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Circles

10/26/14

A circular hole with diameter 6 cm is cut out of a circular piece of card with a diameter of 12 cm.
A circular hole with diameter 6 cm is cutout of a circular piece of card with adiameter of 12 cm. The area of theremaining card, in cm2 , is(A) 6π(B) 27π(C) 36π(D) 108π
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Circles Tangent Graph

10/07/14

what is the portion of the y-axis that cannot be seen?
If Dave is standing at (12,0) next to a silo  of cross-sectional radius r = 7 feet at the indicated position, his vision will be partially obstructed. Find the portion of the y-axis that Dave... more
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10/07/14

Circle Equation
2 x^2+4 x+2 y^2+12 y = 20 is the equation of a circle with and can be written in the general form (x-h)^2 + (y-k)^2 = r^2. Find h, k, and r.
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10/07/14

Circle Question
Recall the equation for a circle with center (h,k) and radius r. At what point in the first quadrant does the line with equation y = 1 x + 4 intersect the circle with radius 4 and center (0, 4)?     more
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10/07/14

Circle Equation
Find an equation of the circle with center at (4,-6) that is tangent to the y-axis in the form of (x-A)^2+(y-B)^2=C where A, B, C are constant.   What is A, B & C?
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10/07/14

Circle Equation
3 x^2+3 y^2-30 x-18 y +27=0 is the equation of a circle with center (h,k) and radius r for:   h = ? k = ? r = ?
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10/07/14

Circle Equation
x^2-4 x+ y^2-14 y = 7 is the equation of a circle with and can be written in the general form (x-h)^2 + (y-k)^2 = r^2. Find h, k, and r.   How do i rewrite it and find those variables?
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Circles

10/07/14

Circle Question
Find the center and radius of the circle with a diameter that has endpoints (-9, 6) and (6, -9).
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Circles Circle Equation

10/07/14

Circle Equation
Find an equation of the circle with center at (4,-6) that is tangent to the y-axis in the form of (x-A)^2+(y-B)^2=C where A, B, C are constant. 
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Circles Geometry

10/02/14

The radius of the circle shown below is 7 inches. What is the approximate length of ? A. 57.7 in B. 44.0 in C. 8.2 in D. 16.5 in
The radius of the circle shown below is 7 inches. What is the approximate length of ?              A.    57.7 in          B.    44.0 in          C.    8.2 in          D.    16.5... more
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Circles

09/30/14

Circles geometry
``The distance around a circular park is 2.8 mi. How many acres does it contain?One square mile contains 640 acres.Round the answer to the nearest integer.''.
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Circles Geometry

09/26/14

circumscribing a circle
How much larger is the side of a square circumscribing a circle 173 cm in diameter than a square inscribed in the same circle? Round the answer to one decimal place
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09/23/14

Circles Math
(i) Given that the line y=mx, where m is a positive integer, does not intersect the circle x2+ y2 -4mx +3=0, find the value of m.   (ii) A line parallel to y=mx is a tangent parallel to the... more
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06/10/14

in point a on the cirlce, angle CAD=3x+9 and angle FAB=2x+21 given that EC and DF are diameters what is the measure of FAB
This question is asking about a circle and it is hard i need some help now
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05/09/14

point problems
1) point (7,-6) and (9,4) are end points of the diameter of a circle. a) What is the length of the diameter? give the exact answer simplify as much as possible show work. b) What is the center of... more
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Circles

04/22/14

secant AB intersects circle O at D, secant AOC intersects circle O at E, AE=4,AB=12, and DB=6. What is the length of OC?
Choices are: a. 9 b. 7 c. 4.5 d. 14   I already tried x2 =(12)(6) and I got 6 square root 2 and also attempted 4x=(12)(6), which=18.
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Circles

04/18/14

diameter of a circle
the diameter of a circle given the points: (0,11)(-4,7/2)  and the radius 
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