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Curved Line – Definition, Examples | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">Curved LineCurved Line – Definition, ExamplesTable of ContentsCurved Line Definition of Curved Line

A curved line is a type of line that is bent rather than straight. It is continuous and smooth without any sharp turns. The curvature of a straight line is zero, so when the curvature of a line is not zero, we call it a curved line. Curved lines can be observed in many everyday objects like rainbows, curved roads, and even in letters such as B, C, and D, unlike letters A, I, and T which contain only straight lines.

Curved lines can be classified into different types. An open curve does not enclose any area and has two endpoints, while a closed curve has no endpoints and encloses an area. Simple curves don't cross themselves when changing direction, and can be either open or closed. Non-simple curves cross their own path at least once. Circles and ellipses are examples of closed curves, where a circle is formed when a point moves in a plane at a constant distance from its center.

Examples of Curved Line Example 1: Identifying Open and Closed Curves Problem:

Identify the open and closed curves from the below figure.

Identifying Open and Closed Curves

Step-by-step solution:

Step 1, Remember what open and closed curves look like. Open curves have two endpoints and don't enclose any area. Closed curves join at the endpoints and enclose an area.

Step 2, Look at each curve in the figure. Check if the curve has endpoints or if it forms a complete loop with no endpoints.

Step 3, Classify each curve based on our observations. The open curves are (b), (d), and (f) because they all have distinct endpoints. The closed curves are (a), (c), and (e) because they form complete loops with no endpoints.

Example 2: Identifying Open Curves in Letters Problem:

Which of the following letters represent open curves? O, U, C, D, S

Step-by-step solution:

Step 1, Recall that open curves have two endpoints and don't enclose an area.

Step 2, Examine each letter one by one:

O - forms a complete loop with no endpoints U - has two endpoints (at the top) C - has two endpoints (at the right side) D - forms a closed shape with no endpoints S - has two endpoints (one at top, one at bottom)

Step 3, Make our final selection. The letters representing open curves are U, C, and S because they all have two endpoints. The letters O and D are closed curves because they form complete loops.

Identifying Open Curves in Letters

Example 3: Identifying Simple and Non-Simple Curves Problem:

Identify the simple and non-simple curves. 8, Q, &, c, o

Step-by-step solution:

Step 1, Remember the definition: simple curves don't intersect or cross themselves when changing direction, while non-simple curves cross their own path.

Step 2, Analyze each character:

8 - crosses itself in the middle Q - crosses itself where the tail intersects the loop & - crosses itself where the loop meets the vertical line c - doesn't cross itself at any point o - forms a simple loop without crossing itself

Step 3, Categorize each character. The simple curves are c and o because they don't intersect themselves. The non-simple curves are 8, Q, and & because they cross their own paths.

Identifying Simple and Non-Simple Curves

Comments(6)SSculptorCaraNovember 6, 2025This clear def of curved lines really helped my kid. Simple explanations make it easy for them to grasp in math lessons!

MMomInTheCitySeptember 17, 2025I’ve been using the curved line definition from this page to help my kids with their geometry homework—it’s super clear and the examples make it easy for them to understand the concept!

NNatureLover85September 10, 2025I’ve been using this site to help my kids with math, and the curved line definition here is super clear! The examples made it so much easier for them to understand. Great resource!

MCMs. CarterAugust 27, 2025I’ve been helping my kid with geometry, and this page made curved lines so easy to understand! The examples were super helpful for visualizing the difference between open and closed curves.

MCMs. CarterAugust 20, 2025I’ve used the curved line definition from this page to explain shapes to my kids, and they really got it! The examples were super helpful for their geometry homework.

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