Only one group on the side of the parallel quadrilateral. Sides parallel to the bottom, both sides are not parallel to the waist, the distance between the two high end.
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tī xíng
梯形 tī xíng
Only two sides parallel to the quadrilateral
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No. 3
梯形
梯形
梯形
Shaped like ladders
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No. 4
梯形
梯形
梯形
[State school] Is a group of the ladder parallel to the side edge and the other group is not parallel quadrilateral. Parallel sides called trapezoid bottom, where long telling them under the bottom; non-parallel sides called back; distance between the two bottom called trapezoidal high. Called a lumbar vertical ladder at the end of the trapezoidal, two waist equal trapezoid is called an isosceles trapezoid. And determine the nature of the trapezoid: A _set_ of sides parallel and the other non-parallel sides of the trapezoidal quadrilateral, but does not determine the other _set_ of parallel edges is difficult, with a group of opposite edges generally parallel to and not equal to determine the trapezoidal quadrilateral. Volume trapezoid formula: v = [s1 + s2 + square root (s1 * s2)] / 3 * h Note: v: volume; s1: on the surface; s2: lower surface; h: high. Trapezoid area formula is: "The high-end plus Bottom multiplied by 2." [Analogy] People often "ladder structure" to simulate some of the things, such as: "Our reasonable personnel structure at this stage should be a ladder structure, the base of large and small above, therefore, we must vigorously develop secondary vocational education, in order to meet pressing social needs of skilled personnel." "V word structure, two of the primary industry and tertiary industry, the bottom of the second industry is different from the domestic industrial structure of this pyramid structure, namely:. Λ word structure, but also from the international ladder structure in some developed countries . " "Just a simple organizational structure in terms of flexibility," the future form of organization, "the authors coast Bell noted that this organization will become more simple, more flexible 'ladder structure'."
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Keystone
梯形
梯形
Is a group of the ladder parallel to the side edge and the other group is not parallel quadrilateral. Both sides of the base of the trapezoid is called parallel, wherein the bottom length Bianjiao; called non-parallel sides of the waist; sandwiched between two vertical segments called bottom trapezoid is high. Called a lumbar vertical ladder at the end of the trapezoidal, two waist equal trapezoid is called an isosceles trapezoid.
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Isosceles trapezoidal nature
等腰梯形的性质
等腰梯形的性质
等腰梯形的性质
等腰梯形的性质
等腰梯形的性质
1. Waist two equal isosceles trapezoid 2. Isosceles trapezoid on the same end of the two bottom corners are equal 3. The two diagonals equal isosceles trapezoid 4. Isosceles trapezoid is the axis of symmetry, where the symmetry axis is a straight line to connect the upper and lower end of the mid-point 5. Isosceles trapezoid bit line (two-dotted line attached to the waist called bit line) is equal to the vertical and the bottom half Note: In some cases, the length of the trapezoid to distinguish between upper and lower end, and not determined by the position, called the end of the shorter end, called the lower end of the longer end.
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Determination
梯形 判定
梯形 判定
梯形 判定
梯形 判定
1. A pair of parallel sides, and the other non-parallel sides of the trapezoidal quadrilateral 2. Two waist trapezoid is equal isosceles trapezoid 3. Trapezoidal bottom two corners on the same equal is isosceles trapezoid 4. There is a corner is a right angle is a right angle trapezoid trapezoid 5. Diagonal trapezoid is equal isosceles trapezoid.
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Perimeter, area
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
梯形 周长、面积
Trapezoid area formula: (bottom + Bottom) × height ÷ 2. Isosceles trapezoid area formula: median line × height By letters: (a + b) × h ÷ 2 Or l · h Trapezoidal Zhou Changgong: the end of the + bottom + back + waist down With letters: a + b + c + d
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Common auxiliary line
梯形 常用辅助线
梯形 常用辅助线
1. As high (one or two, according to the actual topic) 2. Pan a waist 3. Pan diagonal 4. Extended by two waist intersect at one point 5. Take a midpoint waist, the other end points of the connection and prolong the waist. 6. Take the midpoint of the bottom two, over a bottom midpoint of the two parallel lines do waist.
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Encyclopedia
梯形 百科辞典
梯形 百科辞典
Keystone trapezium git trapezoid Keystone Itra detailed mouth .. or tra Long zoid; Tpane "al. A convex quadrilateral (see complete quadrilateral (q industries such as Qing e, com- plete)), in which both sides in parallel, the other two sides are not parallel (see figure). parallel The bottom sides of the trapezoid is called (plus ses), it is called non-parallel sides Waist (lateral sides); connecting the midpoint trapezoidal two lumbar segments called in Line (serving diallline); midline in two parallel trapezoidal bottom, and is equal to And two of the bottom half area of a trapezoid is equal to the length of the line with trapezoid Product of higher or equal to two times the diagonal of the diagonal angle of the sinusoidal plot The back half two equal isosceles trapezoid called ladder (equ port ate- Court reactive bang t dry uIn). Plant two into EC3 a 3 Du Yang translation
