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More generally, an angle subtended by an arc of a curve is the angle subtended by the corresponding chord of the arc. For example, a circular arc subtends the central angle formed by the two radii through the arc endpoints. If an angle is subtended by a straight or curved segment, the segment is said to subtend the angle.
Equal chords are subtended by equal angles from the center of the circle. A chord that passes through the center of a circle is called a diameter and is the longest chord of that specific circle. If the line extensions (secant lines) of chords AB and CD intersect at a point P, then their lengths satisfy AP·PB = CP·PD (power of a point theorem).
The North Jetty is across the river, and clearly visible from the south jetty. The Coquille River Lighthouse, [8] commissioned in 1896, guided mariners to find the dangerous bar at the mouth of the Coquille. The lighthouse was built on or near Rackleff Rock, a rocky obstacle in the channel. The rock became part of the bulwark of the North Jetty ...
The thalweg of a river. In geography, hydrography, and fluvial geomorphology, a thalweg or talweg (/ ˈ t ɑː l v ɛ ɡ /) is the line or curve of lowest elevation within a valley or watercourse. [1] Its vertical position in maps is the nadir (greatest depth, sounding) in the stream profile.
The Missouri River Valley outlines the journey of the Missouri River from its headwaters where the Madison, Jefferson and Gallatin Rivers flow together in Montana to its confluence with the Mississippi River in the State of Missouri. At 2,300 miles (3,700 km) long the valley drains one-sixth of the United States, [1] and is the longest river ...
Bottom Points railway station, railway station on the Zig Zag Railway in the Blue Mountains area of New South Wales; Bottom Wood, 14.5-hectare (36-acre) woodland in the English county of Buckinghamshire, near the hamlet of Studley Green; The Bottom (formerly Botte), the capital and largest town of the island of Saba, the Caribbean Netherlands
The Kootenay River is shown near the bottom left as McGillivray's River. In 1806, explorer David Thompson set out from Saskatchewan to find the source of the Columbia. He crossed over the Canadian Rockies through Howse Pass and eventually arrived on the banks of the Kootenay, which he thought to be the Columbia.
The Arkansas River Valley, also known as the Arkansas Valley, is a region in Arkansas defined by the Arkansas River in the western part of the state. Generally defined as the area between the Ozark and Ouachita Mountains, [1] the River Valley is characterized by flat lowlands covered in fertile farmland and lakes periodically interrupted by high peaks.