Table of Contents
What is radius multiplied by 2?
Diameter
The Diameter of a circle or sphere is equal to 2 times the Radius.
Do you multiply the radius?
To find the area of a circle given the radius, plug in the value of the radius to the formula A = pi r^2. To do this, first you square the radius, then you multiply the result by pi. If the radius of your circle is 2, write out of your formula using 2 instead of r: A = pi (2)^2.
Is the diameter the radius times 2?
The diameter of a circle is a line segment that passes through the center of a circle and has two endpoints at the circumference. It is twice the length of the radius of a circle, i.e., Diameter = 2 × Radius.
Do you square the radius first?
The correct interpretation is to first square the radius and then multiply by pi. Thus for your circle with diameter 4 inches the area is 3.1416 (2×2) = 12.5664 square inches. Mathematically I would write this as pi r2 since the convention is that you perform any exponentiations (the square) before multiplication.
How to calculate the radius and diameter of a circle?
The radius is any line from the centre to the edge of a circle. The diameter is any line from one side of a circle to the other, passing through the centre. The diameter of a circle is twice as long as the radius. To get from the radius to the diameter, we multiply the radius by 2. The radius is 4 cm. 2 × 4 cm = 8 cm.
Why do we say more than one radius?
To say more than one radius we say radii . We can see that all radii are the same length. This is because every radius is simply the distance from the centre to the outside edge. What is the Diameter of a Circle? The diameter of a circle is any line that passes from one side of the circle to the other, through the centre of the circle.
Which is half of the radius of a circle?
The radius of a circle is any line connecting the circle’s centre to its edge. The radius is half the distance from one side of a circle to the other and so, it is half of the diameter. It does not matter which direction the radius is in.
How big is the radius of 10 m?
10 m is the distance from one side to the other, passing through the centre of the circle. The radius is half of this distance. The radius is 1 / 2 × 10. Half of 10 is 5 and so, the radius is 5 m long.