This design shows several circles with the same center. the total radius of the design is 8 inches. the angle shown has a measure of 30°. the shaded section of the outermost ring has a side length of 2 in. what is the perimeter of the shaded portion? express the answer as a decimal rounded to the nearest hundredth.

11.33 in.  to the nearest hundredth.

Step-by-step explanation:

The perimeter of the shaded area =   length of the 2 straight lines + the length of the 2 arcs = 4 + length of the 2 arcs.

Calculate the length of the outer arc:

This equals (30 / 360) * perimeter of the largest circle

= 1/12 * 2 π * 8

= 4/3 π in.

The inner circle has a radius of  8 - 2 = 6 ins

so the length of the inner arc

= 1/12 * π * 2 * 6

= π in.

So the perimeter of the shaded region = 4 + 4/3 π + π

= 4 + 7π/3

=  11.33 in.

step-by-step explanation:

it's 15

explanation:

remove parenthesis:

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apply rule

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multiply fractions:

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divide:

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mordancy.