0
Add your answer:
Earn +20 pts
If the diameter of a circle is 8 feet the radius will be?
The radius would be 4 feet I know this because the diameter is always 2x the size of the radius.
Are all diameters of a circle equal?
By definition, yes! Geometrically speaking, a diameter is a chord which passes through the center of the circle. Also, it is 2x the radius of the circle. Since the radius remains constant for a given circle, so is the diameter.
What is the centre and radius of a circle whose equation is 2x2 plus 2y2 plus 2x -6y -9?
Equation of circle: 2x^2 +2y^2 -2x +2x -6y -9 = 0 Dividing all terms by 2: x^2 +y^2 +x -3y -4.5 = 0 Completing the squares: (x+0.5)^2 + (y-1.5)^2 = 7 Centre of circle is at (-0.5, 1.5) and its radius is the square root of 7
Is a diameter the length of the radius multiplied by pi?
Wrong. It's 2x the radius. The circumference is 2 x radius x Pi
Find area of a circle?
To find the area of a circle you must know the radius or diameter. The diameter is 2x the radius so the radius is 1/2 the diameter. For example, if the diameter is 6, the radius is 3. Next you must square the radius. For our instance, 3 squared is 9. ( 3x3=9) Now you must multiply the squared radius by pi.9 x 3.14= 28.26. (3.14 because it is pi rounded) The area of the circle with a radius of 3 is 28.26. We rounded pi to get 3.14. The formula is A=Pi r2.
How did you get 5 inches for the diameter of a 2.5 radius circle?
Diameter of a circle is always twice the radius. So if the radius is 2.5 then diameter is 2x 2.5=5
What is the diameter of a circle with a radius of 9Cm?
r= 9 so diameter is 2x the radius =18 cm
If the diameter of a circle is 8 feet the radius will be?
The radius would be 4 feet I know this because the diameter is always 2x the size of the radius.
Are all diameters of a circle equal?
By definition, yes! Geometrically speaking, a diameter is a chord which passes through the center of the circle. Also, it is 2x the radius of the circle. Since the radius remains constant for a given circle, so is the diameter.
A large circle has a radius of 10cm Given four congruent circles tangent to one another within the large circle what is the radius of the largest circle which will fit in the middle?
Letting x be radius of the 4 circles, then (squareroot(2x^2))+x=10, or x(1+sqrt2)=10. Then radius of circle in middle is ((2*10)-4x)/2. So I get radius of circle in middle = 1.715729 approximately.
What is difference between a radius and a diameter?
Radius is the shortest distance via straight line between the center point of the circle and its perimeter. Diameter is the greatest distance via straight line from one perimeter of the circle to the opposite perimeter. Diameter = 2x Radius.
What is the centre and radius of a circle whose equation is 2x2 plus 2y2 plus 2x -6y -9?
Equation of circle: 2x^2 +2y^2 -2x +2x -6y -9 = 0 Dividing all terms by 2: x^2 +y^2 +x -3y -4.5 = 0 Completing the squares: (x+0.5)^2 + (y-1.5)^2 = 7 Centre of circle is at (-0.5, 1.5) and its radius is the square root of 7
What is the equation of a circle with center 1and 5 and radius 2?
A circle with centre (xo, yo) and radius r has formula: (x - xo)2 + (y - yo)2 = r2 For circle with centre (1, 5) and radius 2 this is: (x - 1)2 + (y - 5)2 = 22 x2 - 2x + 1 +y2 - 10y + 25 = 4 x2 - 2x + y2 - 10y + 22 = 0
Is a diameter the length of the radius multiplied by pi?
Wrong. It's 2x the radius. The circumference is 2 x radius x Pi
What is the length of the arc on a circle of radius r equals 5 yards intercepted by a central angle theta equals 70 degrees?
To work out the length of the arc on a circle, you need to work out the proportion of the full circle that the arc represents. This is the proportion of the circumference of the circle. The circumference of a circle is 2 times pi times radius or 2{pi}r A full circle has 360o so an arc created between 2 radii with an angle of ao between them has a length that is a/360 that of the full circle, ie length of arc = 2{pi}ra/360 Thus, for a circle of radius r=5yds and angle=72o, the length of the arc is: 2x{pi}x5x72/360 = 2x{pi}x5x1/5 = 2x{pi} ~= 6.28yds
What percentage of the square is occupied by the circle when it is inscribed in a square and tangent at all four sides?
Say the radius of the circle is x. This makes the area of the circle pi x2. Since the length of the square's sides is the diameter of the circle, 2x, its area is 2x * 2x = 4x2. The percentage occupied by the circle is the area of the circle divided by the area of the square times 100 pi/4 x 100; pi/4 x 100 = 100pi/4 = 25pi = 78.6%.
How you find the area of a circle?
To find the area of a circle you must know the radius or diameter. The diameter is 2x the radius so the radius is 1/2 the diameter. For example, if the diameter is 6, the radius is 3. Next you must square the radius. For our instance, 3 squared is 9. ( 3x3=9) Now you must multiply the squared radius by pi.9 x 3.14= 28.26. (3.14 because it is pi rounded) The area of the circle with a radius of 3 is 28.26. We rounded pi to get 3.14. The formula is A=Pi r2.
