Find radian and arc length Arc length, length 4.25cm, rotation 90 degrees how long? Radian, diameter 77cm, 4cm long arc how many degrees? My little brother didn't learn geometry well at school. Over the years, the rest has gone with the wind, Sorry, I didn't make it clear. It is to find a circle with a diameter of 8.5, take the center of the circle as the center, turn the radius 90 degrees, and the distance (arc length)

Find radian and arc length Arc length, length 4.25cm, rotation 90 degrees how long? Radian, diameter 77cm, 4cm long arc how many degrees? My little brother didn't learn geometry well at school. Over the years, the rest has gone with the wind, Sorry, I didn't make it clear. It is to find a circle with a diameter of 8.5, take the center of the circle as the center, turn the radius 90 degrees, and the distance (arc length)

First, 2 * pi * r / 360 * 90 = 2 * 4.25 * 3.14 * 90 / 360=
Second, 4 / (2 * pi * r) * 360 = 4 / (2 * 3.14 * 77 / 2) * 360=
Remember the circumference of the circle and the corners are 360
Divide each degree and multiply the arc length and angle
Remember the area of the circle, the circumference is 360
Divide each degree by sector and multiply by angle

Radian formula of sector area and arc length It's the kind learned in high school. It's not angle, it's radian

Arc length * radius / 2 or square of radius * radian / 2
There is a notation that you can compare it to a triangle. Take the arc length as the bottom, the height is the radius, and then the area is half the bottom times the height. Similarly, that fan ring can be compared to a trapezoid

If the arc length of the center angle of 1 radian is equal to 2, the chord length of the center angle is equal to 06

If the arc length of the center angle of a = 1 radian is C = 2, then the chord length of the center angle is l?
The arc radius is r
R=C/A=2/1=2
A = 1 radian = 1 * 180 / pi = 57.3 degrees
L=2*R*SIN(A/2)
=2*2*SIN(57.3/2)
=1.918

If the chord length of the center angle of 1 radian is equal to 2, the arc length of the center angle is equal to () A. sin1 two B. π six C. 1 sin1 two D. 2sin1 two

Let the radius of the circle be r
2=1，
∴r=1
sin1
2，
‡ arc length L= α• r=1
sin1
2．
So choose C

If the chord length of the center angle of 1 radian is equal to 2, the arc length of the center angle is equal to? A.sin1/2 B.π/6 C.1/(sin1/2) D.2sin1/2

Find R: sin (1 / 2) = AB / 2R = 1 / R, then r = 1 / sin (1 / 2), and L = R * 1 = r = 1 / sin (1 / 2), so choose C

The chord length of the center angle of 1 radian is 2. Find the arc length of the center angle and the area of the sector sandwiched by the center angle

It is known that r = 1
sin1
2，∴l=r• α= one
sin1
two
S Fan = 1
2l•r=1
2•r2• α= one
2•1
sin21
2=1
2sin21
2．