According to class 8
How is standard one kilogram defined in SI units?
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Answer:
Explanation:
This article is about four-sided mathematical shapes. For other uses, see Quadrilateral (disambiguation). Quadrilateral Some types of quadrilaterals Edges and vertices 4 Schläfli symbol {4} (for square) Area various methods; see below Internal angle (degrees) 90° (for square and rectangle) In Euclidean plane geometry, a quadrilateral is a polygon with four edges (sides) and four vertices (corners). Other names for quadrilateral include quadrangle (in analogy to triangle), tetragon (in analogy to pentagon, 5-sided polygon, and hexagon, 6-sided polygon), and 4-gon (in analogy to k-gons for arbitrary values of k). A quadrilateral with vertices {\displaystyle A}, {\displaystyle B}, {\displaystyle C} and {\displaystyle D} is sometimes denoted as {\displaystyle \square ABCD}.[1][2] The word "quadrilateral" is derived from the Latin words quadri, a variant of four, and latus, meaning "side". Quadrilaterals are either simple (not self-intersecting), or complex (self-intersecting, or crossed). Simple quadrilaterals are either convex or concave. The interior angles of a simple (and planar) quadrilateral ABCD add up to 360 degrees of arc, that is[2] {\displaystyle \angle A+\angle B+\angle C+\angle D=360^{\circ }.} This is a special case of the n-gon interior angle sum formula: (n − 2) × 180°. All non-self-crossing quadrilaterals tile the plane, by repeated rotation around the midpoints of their edges.
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.62607015×10−34 when expressed in the unit J⋅s, which is equal to kg⋅m2⋅s−1, where the metre and the second are defined in terms of c and ΔνCs.