61 Answered Questions for the topic Circle

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What Fraction of The Circumference Radians

4pi/3 Describe what fraction of the circumference of a full circle is spanned by an angle with the given measure

07/04/19

Pre-Calculus: Circle

It has a diameter with endpoints A(-1,4) and B(4,2)

06/04/19

HELP, Please! Math :open ended explain

What is the surface area and volume of the sphere shown below?

05/17/19

I need to work out the elipse a half circle that is vertical leaves on to a pitched surface

Say the half circle had a radius of 800mm and it was casting back of to a pitched line of 45 degrees it would leave an elipse how do i work that out ? And is therr a set formula so i can change... more

04/14/19

Horizontal Height in a Circle in terms of Time

Background: a Ferris Wheel has a diameter of 135 feet and a maximum height of 150 feet. Its ride duration is 10 minutes and it makes two complete rotations in this time. Assume that at time t = 0,... more

04/08/19

How would you rotate a circle?

I know you logically don't have to, since it is a circle after all, but what would the formula be (in standard form) for a cicle (or semicircle I suppose) turned by, say, π/2 (90°)?

04/07/19

How do you convert a shifted parametric circle equation to rectangular form?

x=-2cos((1/2)t-(π/2))+23y=2sin((1/2)t-(π/2))+6specifically, how do you separate the stuff inside the cos/sin parenthesis to eliminate a parameter? I find all kinds of solved simple circle... more

04/07/19

Raidus of a Circle With Given Information

A chord is 48cm and another chord is 40cm. The 48cm chord is 8cm closer to the center of the circle than the 40cm chord. What is the radius of the circle?

03/22/19

Circle diameter and revolution

A wheel of a compact car has a 25-inch diameter. The wheel of a pick up truck has 31-inch diameter. To the nearest inch, how much further does the pick up truck wheel travel in one revolution than... more

03/10/19

Trigonometry and equation of a circle

Consider the circle with equation x^2+y^2-4y=0 and the point P(5,2). Draw a diagram to show the circle and the two lines from P that are tangent to the circle. Find the angle between the two... more

02/04/19

Radius √14 and center (−6,−7)

Find the standard form of the equation for the circle with the following properties.

08/25/18

Finding Perimeter and Area on a cross section

I don't really get how cross-section works. So um, this is the problem:   "You cut the cake vertically to make two congruent parts." Image: https://i.imgur.com/QfyZQ8d.png   A) Find the... more

08/19/18

standard equation of a circle given endpoints of diameter are (-2,3) and (6,-4)

standard equation of a circle given endpoints of diameter are (-2,3) and (6,-4) for my precal assignment, i just want to check my answer:) 

07/11/18

A sector with central angle θ is cut from a circle of radius R = 24 inches, and the edges of the sector are brought together to form a cone.

A sector with central angle θ is cut from a circle of radius R = 24 inches (see figure), and the edges of the sector are brought together to form a cone. Find the magnitude of θ such that the... more

06/30/18

what is the general equation for (0,0) with the radius of 5

x2-y2=5

06/07/18

Write the equation in standard form:

given the following equation of the ellipse in general form, 3x^2+y^2-6x+4y+4=0, complete the square to write the equation in standard form.

05/24/18

Find angle ACB in terms of x using tangent

Angle ABC = xLine BC is tangent to circle centre OLine AOC is a straight lineFind angle ACB in terms of xI got 270-2x:Angle OAB = OBA = x-90Angle ACB= 180-(x-90)-xApperently this is the wrong... more

03/28/18

Draw a scaled copy of the circle using a scale factor of 2.

The circle has a radius of 3/4 inches.

03/19/18

Pi Day Problem

If the top surface of a particular slice of pie is a sector of a circle with a vertex angle measuring 20 degrees and the length of the arc is 3.14π units, what is the perimeter(left in terms of π)... more

02/15/18

Find the value of x if ( 60-3x) and (4x-7) are the opposite angles of any cyclic quadrilateral

I am confused by this, and unable to understand this 

12/15/17

Each side of a regular septagon (7 sides) is 10cm long. What is the radius of the inscribed circle?

 I don't want it done using a formula. I want to learn how to do it using cos, tan, sin or sin(a)/A = sin(b)/B, sin(b)/B=sin(c)/C.
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