Please help, its for a test in khan academy
1 answer:
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See below for the examples of sectors and arcs of a circle
<h3>Area of sector of a circle</h3>The area of a sector is calculated as:
---- when the angle is in degrees
---- when the angle is in radians
Take for instance, we have the following problems involving sector areas
Calculate the area of a sector where the radius of the circle is 7, and
- The central angle is 30 degrees
- The central angle is π/12 rad
- The central angle is 90 degrees
- The central angle is π/4 rad
- The central angle is 180 degrees
Using the above formulas, the sector areas are:
1.
2.
3.
4.
5.
The length of an arc is calculated as:
---- when the angle is in degrees
---- when the angle is in radians
Take for instance, we have the following problems involving arc lengths
Calculate the length of an arc where the radius of the circle is 7, and
- The central angle is 30 degrees
- The central angle is π/12 rad
- The central angle is 90 degrees
- The central angle is π/4 rad
- The central angle is 180 degrees
Using the above formulas, the arc lengths are:
1.
2.
3.
4.
5.
The examples include:
- A parabolic path
- Distance in a curve
- Curved bridges
- Pizza
- Bows
Read more about arc and sectors at:
#SPJ1
