SKU: 66507946952

Shadows of the Circle

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Description

Shadows of the CircleThe aim of this book is to throw light on various facets of geometry through development of four geometrical themes. The first theme is about the ellipse, the shape of the shadow cast by a circle. The next, a natural continuation of the first, is a study of all three types of conic sections, the ellipse, the parabola and the hyperbola. The third theme is about certain properties of geometrical figures related to the problem of finding the largest area

The aim of this book is to throw light on various facets of geometry through development of four geometrical themes.

The first theme is about the ellipse, the shape of the shadow cast by a circle. The next, a natural continuation of the first, is a study of all three types of conic sections, the ellipse, the parabola and the hyperbola.

The third theme is about certain properties of geometrical figures related to the problem of finding the largest area that can be enclosed by a curve of given length. This problem is called the isoperimetric problem. In itself, this topic contains motivation for major parts of the curriculum in mathematics at college level and sets the stage for more advanced mathematical subjects such as functions of several variables and the calculus of variations.

The emergence of non-Euclidean geometries in the beginning of the nineteenth century represents one of the dramatic episodes in the history of mathematics. In the last theme the non-Euclidean geometry in the Poincar

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SKU: 66507946952

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Joseph Klobuchar
Carnegie, US
★★★★★ 5
Just lovely
Size: 8.5" x 5.8" x 1.9", Color: Orange
Purchased this several months ago and liked it, but I had received so many complements on this tray since then I had to submit this review. The tray is sturdy and put together well, and the size is exactly what was given before purchase.
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Reviewed in the United States on May 27, 2026
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Verified Purchase
Michelle Craigen
Dallas, US
★★★★★ 5
So Much Fun! High Quality & Perfect Alexa Smart Integration.
Color: Black
I use these Govee RGBIC Light Bars every single day in my room, and they have completely upgraded the vibe of my workspace. If you want to add some serious personality to your setup, these are an absolute must. The fit is perfect right behind my monitor, completely transforming the overall appearance of my desk area. I have them seamlessly connected to Alexa, so all I have to do is say, "Alexa, turn on my Govee lights," and they click right on. While you can use a remote control or the app, the voice activation makes them incredibly convenient. It is just a lot of fun to play with the different settings. You can change the colors instantly to give the room whatever mood or feel you are in the mood for. The build quality feels solid, and after months of daily, continuous use, the durability is excellent with no flickering or dimming. It has truly added a new level of enjoyment and style to my office space. PROS: High-quality appearance that makes any desk or TV setup look professional Tons of fun color combinations and dynamic mood settings Flawless smart home compatibility with Alexa Great durability for daily, long-term use CONS: There are so many features and color modes in the Govee app that it can take a little bit of time to learn where everything is, but it is worth it.
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Reviewed in the United States on May 23, 2026
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Verified Purchase
Archer Varenhorst
Chelsea, US
★★★★★ 5
Perfection for my space
Color: Black
I already own a few led lights from this company but these are on edge they deserve 500/10 stars in installation was extremely easy controlling with the app and the included remote controller which is wired they are extremely fun to use and very high quality light bars that are a great fit almost anywhere the versatility is great and can be used at any mood or time with the app or wired controller Thank you GOVEE
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Reviewed in the United States on May 26, 2026
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Verified Purchase
Phillip
Alexandria, US
★★★★★ 5
Cool light bars
Color: Black
Lights work great. Easy to install and connect to the app. Endless color options and they fit perfect on my desk. I stuck two of the behind my monitor and two on the side to make nice ambient light. I like that you dont need the app to turn on the lights.
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Reviewed in the United States on April 1, 2026
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Verified Purchase
KCM
Alexandria, US
★★★★★ 4
Decent Light Bars, But More Options in the App
Color: Black
The Govee RGBIC Light Bars are pretty decent overall. The lights are bright and add a nice atmosphere behind the TV. The 15-inch bars fit well for a TV setup in the 45–70 inch range, and the different placement options make it easy to set them up the way you want. They do have some regular lighting settings you can use without connecting to the app, which is convenient if you just want simple colors. Setup is fairly easy and they look clean behind the TV. That said, I do wish there were more options available without having to rely on the app. The basic settings work fine, but it would be nice to have a few more built-in modes. Overall, they’re solid lights that look good and work well, especially if you like adding ambient lighting to your TV area.
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Reviewed in the United States on March 16, 2026

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