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A fan, chord length 2.8 meters, arch height 0.415 meters, how much is the arc length?
For a sector, chord length L = 2.8m, arch height h = 0.415m, what is the arc length C?
The radius of arc is r, and the center angle of arc is a
R^2=(R-H)^2+(L/2)^2
R^2=R^2-2*R*H+H^2+L^2/4
2*R*H=H^2+L^2/4
R=H/2+L^2/(8*H)
=0.415/2+2.8^2/(8*0.415)
=2.569 M
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((2.8/2)/2.569)
=045 degrees
=66.045*PI/180
=1.152708 radians
C = R * a = 2.569 * 1.152708 = 2.961m
If the chord length of the central angle of a circle with radian 2 is 2, then the area of the sector sandwiched by the central angle of the circle is 2___ ．
∵ radian is the center angle of 2, the chord length is 2, the radius ob = 1sin1. The area formula of sector s = 12 × ob2 × 2 = 1sin21, so the answer is: 1sin21
The calculation formula of sector diameter: the length of the top chord is 130, the length of the bottom chord is 120, the distance between the two chord lengths is 80, what is the radius
The calculation formula of sector diameter: the upper chord length L1 = 130, the lower chord length L2 = 120, the distance between the two chord lengths H = 80, what are the upper arc radius R1 and the lower arc radius R2? The center angle of the sector is A.A = 2 * arc Tan (((L1-L2) / 2) / h) = 2 * arc Tan (((130-120) / 2) / 80) = 7.153 degrees, R1 = (L1 / 2) / (sin (A / 2)) = (130 / 2)
How to draw sector statistical chart and how to calculate percentage and degree
Use 360 ° to divide the number of copies = the degree of each copy
Take away what you have and take up what you have
The probability is calculated by using 360 ° x probability
If the radius of a circle is equal to 2cm and a chord in the circle is 2 √ 3, then the distance between the midpoint of the chord and the midpoint of the arc opposite to the chord is equal to ()
The distance between dot and chord d = √ (2 ^ 2 - (2 √ 3 / 2) ^ 2) = 1
The distance between the midpoint of the chord and the midpoint of the arc is R-D = 1
In the ⊙ o with a radius of 5cm, the length of two parallel strings is 6cm and 8cm respectively, then what is the distance between the two strings?
The discussion is divided into two cases: two strings are on the same side of the center or two strings are on both sides of the center, OE ⊥ AB is at point e through point O, of ⊥ CD is at point F, OA, OC, AE = 12ab = 4 (CM), CF = 12CD = 3 (CM), OE = oa2 − AE2 = 3 (CM), of = oc2 − CF2 = 4cm are connected
As shown in the figure, the diameter ab of circle O intersects with CD at E. AE = 1 cm.BE=5cm Angle DEB = 30 degrees for CD long plus drawing!
You're in junior high school or high school. High school is over,
As shown in the figure, the ratio of the degree of arc AB and arc ACB that chord AB divides circle O into two arcs is 1:3
Connecting OA, ob,
Then ∠ AOB = 1 / 4 × 360 ° = 90 °,
∴∠ACB=1/2∠AOB=45°,
If the position of D is not specified, the ∠ ADB cannot be solved,
If D is on inferior arc AB, then ∠ ADB = 135 ° (complementary with ∠ C)
The ratio of the length of the two arcs divided by the chord is 2:7, and the degree of the circular angle of the chord is______ ．
∵ string AB divides ⊙ o into two parts of 2:7, ∵ AMB = 360 °× 79 = 280 °, ∵ AOB = 280 °, ∵ AMB = 12 ∵ AOB = 12 × 280 ° = 140 °, ∵ anb = 180 ° - ∵ AMB = 180 ° - 140 ° = 40 °. So the answer is: 40 ° or 140 °
As shown in the figure, AB and AC are respectively the diameter chord of ⊙ o, ∠ BAC = 30 ° OD ⊥ AB, intersect with AC at point D, OD = 5cm, and calculate the chord AC
circular
Connect to OC
Then the angle c = 30 degrees
Because the angle ODC is 120 degrees
So od = OC
AD=2OD=10
So AC = 10 + 5 = 15
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