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Semi Circle
Semi-rimless small women’s eyeglass frames
Eyeglass frames come in mainly three basic styles, including full frames, semi-frames and rimless ones. In fact, eyeglass frames produced by various manufacturers differ little in other aspects such as temples and nose pads. The most significant difference always lies in frame style. In the old days, all types of eyeglass frames had full frames. This simply means that the lens frame has two round circles which wrap around the respective eyeglass lenses. Of course, this style of eyeglass frames is still around currently. But to some extent, they are losing popularity gradually. Most eyeglass wearers consider full frames as a traditional style. The second style is semi-rimless. A pair of semi-rimless eyeglasses has a lens frame which has only two half circles. The two lenses are only half covered by the eyeglass frame. In a natural design, the half part of the frame touches the upper part of the lenses, rather than the bottom part. Compared with full frames, semi frames use fewer materials and look more concise. A pair of proper eyeglasses usually functions as a fashionable accessory for women. Nowadays, there are many brands that provide semi-rimless small women’s eyeglass frames.
Compared with rimless eyeglass frames, semi-rimless ones are more conventional. Some ladies really like to be more stylish by wearing rimless eyeglasses. In fact, those rimless eyeglasses have no complete frame. The lenses are directly connected to the temples using tiny screws. Many people would think rimless frames are more concise and simple. But there is still a common concern about safety. Rimless eyeglasses are more likely to break under certain pressure or in an unlucky instance. Without certain support from a frame, the lenses are more fragile once there is a hit. As a result, many women choose to wear semi-rimless eyeglasses, which compromise little lens security while granting enough attractiveness. In a gradual way, semi-rimless spectacles become even smaller. This trend is probably a response to many women’s special tastes
Currently, semi-rimless small women’s eyeglass frames are available from both traditional and online eyewear stores. Similar to other eyeglass types, women’s semi-rimless eyeglasses come in more options on the Internet. Typing “semi-rimless small women’s eyeglass frames” in Google, there are many online retailers that provide these products. Top ones include zennioptical.com, ehow.com, and firmoo.com and so on. In particular, firmoo.com offers semi-rimless women’s frames with special feminine styles and colors. These frames are provided in many materials including metal, plastic, memory metal, titanium and mixed materials.
About the Author
Firmoo.com is the emerging online optical store selling high quality eyewear, such as prescription eyeglasses (single vision myopic glasses, reading glasses, bifocal and progressive eyeglasses etc.,), prescription sunglasses (with RX tinted lenses), prescription sports goggles. Firmoo guarantees lowest possible price in the market. Firmoo's return and refund policy makes any purchase risk-free ones.
Find the area of the portion of the semi circle?
Find the area of the portion of the semi circle of radius 15 m that is outside the area of an inscribed square if the base of the square lies on the diameter of the semi-circle.
The answer given in the book is 173. 43 m^2. What must be the right solution? Thanks!
If you sketch it then you will see that two corners of the square intersect the
semicircle and the other two corners intersect the circles diameter.
If you draw a line (of length = radius) from the circle center to one of the corners
of the square that intersects the semicircle ; then you'll see that the slope of
that line is 2 based on the square's dimensions.
Examining the right triangle formed by that line and the square reveals that it is a
1 : 2 : R (ratios) right triangle where the "2" side is the length of the side of the
square.
The triangle's angle at the circle center = arctan [2]
Taking the "sine" of that value allows you to find the square side:
tanˉ¹ [2] = arctan [2] = 63.435 degrees
sin [63.435] = (square side) ⁄ R = (square side) ⁄ 15
square side = 13.4164 meters
The area of the square is:
Asq = (side)² = (13.4164)² = 180 m²
and the area of the semicircle is:
Asc = π • R² ⁄ 2 = π • (15)² ⁄ 2 = 353.42917 m²
Difference = Asc − Asq = 173.42917 m²
semi circular text with Gimp