Monday
December 22, 2014

Homework Help: Trigonometry

Posted by Britt on Monday, June 21, 2010 at 6:42pm.

I am trying to help my child out with a problem but yeah I am finding it veyr hard.

Gabe is spending two weeks on an archaeological dig. He finds a fragment of a circular plate that his leader thinks may be valuable. The arc length of the fragment is about 1/6 the circumference of the original complete plate and measures 1.65 inches. A similar plate found earlier has a diameter of 3.14 inches.

Write an an expression for the radius, r, of the earlier plate.
r=2π
r=π/4
r=π/3
r=π/2

What is the measure, in radians, of a central angle, θ, that intercepts an arc that is 1/6 the length of the circumference of a circle?
θ=2π/6
θ=2π/5
θ=2π/4
θ=2π/3

Write an expression for the arc length, S, intercepted by this central angle

Could Gabe's plate be a matching plate? Explain.

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