How can I understand geometry in order to calculate the length of a circle?

timer Asked: Oct 30th, 2015
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School: UIUC

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If the measure of angle PLA is 110 then the measure of angle PDA is 220. An inscribed angle (that touches the inside surface of the circumference) has a measure half as large if the angle's middle point (in this case D) is at the center of the circle. The measure of angle PDA will be the same as the measure of arc length as PYA which the angle would encompass. Thus, 220=12x-20

Add 20 to both sides of the equation.

240=12x Divide both sides by 12


The answer is C.

Please let me know if you need any clarification. I'm always happy to answer your questions.

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Thanks, good work

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