The area of a circle is pi times the radius squared (A = π r²).

38.48 square centimeters (cm²)

If you want an exact answer, you can multiply 7 by the value of π , that is ≈3.14 .

What is the area of a circle with diameter 6 cm?

194.835 square inches (in²)

78.5 cm2

To calculate arc length without radius, you need the central angle and the sector area:

1. Multiply the area by 2 and divide the result by the central angle in radians.
2. Find the square root of this division.
3. Multiply this root by the central angle again to get the arc length.

Arc length = 2πr (θ/360) θ = the angle (in degrees) subtended by an arc at the center of the circle. 360 = the angle of one complete rotation.

In general, an arc is a portion of a curve. In mathematics, unless otherwise stated, an arc usually refers to a portion of a circle. Types of arcs. A chord, a central angle or an inscribed angle may divide a circle into two arcs. The smaller of the two arcs is called the minor arc.

A minor arc (left figure) is an arc of a circle having measure less than or equal to ( radians).

A minor arc is less than 180° and is equal to the central angle. The central angle is formed with its vertex at the center of the circle, whereas a major arc is greater than 180°. And to reinforce this idea, we use two letters when describing a minor arc and three letters when identifying a major arc.

Minor arcs are named with the word “arc” or the words “minor arc” and two or three letters (usually two letters). For example arc(BC), minor arc(BC), arc(BDC) and minor arc(BDC) all refer to the minor arc shown in the illustration below.

An arc defined by two rays is a fractional part of a circle. For example, the measure of an arc defined by a quarter of a circle is simply a quarter of 360 = 90 degrees. Points A, B, C, D lie in this order on the circumference of a circle. Minor arc AC is 160°, and minor arc BD is 140°.

Any two points on a circle divide the circle into two arcs: a minor arc (the smaller piece) and a major arc (the larger)—unless the points are the endpoints of a diameter, in which case both arcs are semicircles.

this means that the measure of arc AB is equal to 64 degrees and the measure of arc BC is equal to 104 degrees. your solution is that the measure of arc AB is 64 degrees.

The arc length formula is used to find the length of an arc of a circle; ℓ=rθ ℓ = r θ , where θ is in radian. Sector area is found A=12θr2 A = 1 2 θ r 2 , where θ is in radian.

Unless stated otherwise, it always means the minor arc – the shortest of the two. If you want to indicate the major arc, add an extra point and use three letters in the name. For example in the diagram above, the major arc is indicated by which is the long arc from A to B going around the bottom via K.

Minor arcs are associated with less than half of a rotation, so minor arcs are associated with angles less than 180°. Major arcs are associated with more than half of a rotation, so major arcs are associated with angles greated than 180°.

The Longest chord of any circle is its diameter. Therefore, the diameter of a circle is twice the radius of it.