A circle has a radius of 8cm. What is the area of the sector with a central angle of 80∘? 1289𝜋cm2 1618𝜋cm2 169𝜋cm2
Question
A circle has a radius of 8cm. What is the area of the sector with a central angle of 80∘? 1289𝜋cm2 1618𝜋cm2 169𝜋cm2
Solution
The area of a sector of a circle can be found using the formula:
Area of sector = (central angle/360) * π * r²
where:
- the central angle is given as 80 degrees,
- r is the radius of the circle, which is given as 8 cm.
Substituting these values into the formula gives:
Area of sector = (80/360) * π * 8²
Solving this gives:
Area of sector = (2/9) * π * 64
Area of sector = 128/9 * π cm²
So, the area of the sector with a central angle of 80 degrees is 128/9 * π cm². This is not exactly equal to any of the options given, but it is closest to 169𝜋cm².
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