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For all circles , however, large or small The diameter is twice the radius.
Diameter(d) equals(=) radius(r) plus(+) radius(r).
d = r + r
d = 2r .
NB The diameter is a straight line from the circumference to the centre , and then out to the opposite sided circumference.
It is NOT an angled line centred on the central point.
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What is the radius of a circle with the diameter of 6?
The diameter is the length of a straight line, from one side of the circle to the other, passing through the centre. The radius is a straight line from the circle centre to the circle itself and is always = half the length of the diameter, so 6 * 0.5 = 3
What is the length of a biggest chord of a circle of radius 4cm?
It is the diameter which is twice the radius giving a length of 8 cm
How is 25.133 the circumference of a circle with a radius of 4?
Radius = 4 so diameter is 8. 2xR = D Circumference formula: C = pi x diameter So 25.133 = 3.14 x 8
What is the circumference of 8cm?
Clarity please!!!! 'Circumference of what??? Also what does the 8 cm represent . diameter, radius, diagonal etc., !!!!
What is the equation of a circle whose diameter's end points are at 2 -3 and 8 7?
The mid point of the diameter is the circle's centre: Mid point of (2, -3) and (8, 7) is ((2 + 8)/2, (-3 + 7)/2) = (5, 2) The radius is half the diameter, but as the equation for a circle requires the radius squared: radius = diameter/2 → radius² = diameter² / 4 Diameter (and diameter²) can be found using Pythagoras: diameter² = change_in_x² + change_in_y² = (8 - 2)² + (7 - -3)² = 6² + 10² = 136 → radius² = 136/4 = 34 Circle with centre (X, Y) and radius r has equation: (x - X)² + (y - Y)² = r² → (x - 5)² + (y - 2)² = 34 → x² -10x + 25 + y² - 4y + 4 = 34 → x² + y² - 10x - 4x - 5 = 0
