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March 5, 2015

March 5, 2015

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

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.

- Trigonometry -
**MathMate**, Monday, June 21, 2010 at 7:52pm*Write an an expression for the radius, r, of the earlier plate.*

The earlier plate has a diameter of 3.14 inches, approximately equal to π inches.

The radius equals half the diameter.

*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?*

The central angle of a complete circle is 360°, or 2π radians.

So the central angle of an arc equal to 1/6 of the circumference is therefore 1/6th of the complete circle. Therefore the central angle is (1/6)*2π.

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

The arc length of radius r and central angle θ is rθ. Since r and θ are known, solve for arc length.

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

It is most likely a matching plate, because the 1/6th of the arc of the previous plate has an arc length of 3.14*π/6=1.643, well within the accuracy expected of the later plate.

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