lisamiller
31.10.2019 •
Mathematics
what is the approximate area of a sector given θ≈92 degrees with a diameter of 9m?
question 2 options:
60 m²
65 m²
15.6 m²
16.2 m²
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Ответ:
a. not true. This confuses the diameter (=2r) with the radius (=r).
b. correct. 2πr = 6.28 when 2r=2.
c. correct. if 2πr = 2π, then r must be 1, so area πr² = π1² = π
d. not true. if 2πr = π, then r must be 1/2, so area πr² = 1/4π
e. correct. if r = 1.5, then πr² = 3.14*(1.5)² = 7.065