A steradian can be defined as the solid angle subtended at the centre of a unit sphere by a circular unit area on its surface. For a general sphere of radius r, any portion of its surface with area A = r subtends one steradian at its centre. The solid angle is related to the area it cuts out of a sphere: Ω is the … Meer weergeven The steradian (symbol: sr) or square radian is the unit of solid angle in the International System of Units (SI). It is used in three-dimensional geometry, and is analogous to the radian, which quantifies planar angles. … Meer weergeven Millisteradians (msr) and microsteradians (μsr) are occasionally used to describe light and particle beams. Other multiples are rarely used. Meer weergeven • Media related to Steradian at Wikimedia Commons Meer weergeven If A = r , it corresponds to the area of a spherical cap (A = 2πrh) (where h stands for the "height" of the cap) and the relationship … Meer weergeven • n-sphere • Spat (angular unit) • IAU designated constellations by area Meer weergeven Web"Sr." is a lovingly irreverent portrait of the life and career of maverick filmmaker Robert Downey Sr. that quickly devolves into a meditation on art, mortality, and healing …
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