The radius of the circle is 60 mm. find the circumference to the nearest millimeter. find the length of the arc
| April 28, 2021 | education
The radius of the circle is 60 mm. find the circumference to the nearest millimeter. find the length of the arc corresponding to the angle c: a) 90 degrees b) 240 degrees
The circumference is
l = 2Пr, where l is the circumference, r is its radius, П = 3.14 is the number of Pi,
l = 2 * 3.14 * 60 = 376.8 mm.
The length of the arc formed by the angle 900 is one fourth of the circumference and is equal to:
376.8: 4 = 94.2 mm.
For 2400 we make the proportion: if at 3600 the circumference is 376.8 mm, then at 2400 – x, then x = 376.8 * 240: 360 = 251.2 mm.
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