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Work out the circumference of the circle and then divide it by 4

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Q: How do you find the length of the curved part of the quartercircle?
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How to find the length of the curved part of the semicircle?

A circle is two semicircles put together. The circumference of a circle is the length around it, so half of that would be what you are aiming for. Let's call the circumference "c" and the radius (the straight part of the semicircle) "r". Pi is also needed in this problem, so we can use "π". The equation for the circumference of a circle is c=2πr. Replace "r" with the length of the straight part of the circle, and do the math. Divide your answer by 2.Example:r=2c=2πrc=2π2c=4πc=(approximately)12.5712.57 divided by 2 equals approximately 6.29.The length of the curved part of the semicircle is 6.29!Hope this helps!


How do you find the arc in a sector?

If it is a sector of a circle then the arc is the curved part of the circle which forms a boundary of the sector.


What does it mean for a straight line such as a radius to be equal in length to a curved line such as an arc of a circle?

Length of any curve is imagined as an infinite sum of the lengths of infinitely small straight sections. If you look at a part of circle under a microscope you cannot tell that it is curved. This idea is used extensively in the branch of mathematics call "integral calculus". On a practical level, you can lay out a circle with a length of wire, then straighten it out to measure its length.


Is the optical axis parallel to the curved surface?

No. It's straight through the center of the sphere that the curved surface is part of.


A 30-inch segment is cut into two parts whose lengths have the ratio 3 to 5 Find the length of each part Does anyone know how to figure this out?

Divide 30 by 8 (5+3). Multiply the answer by 3 for the one part length and 5 for the other part length.