math and applied math > a right angle echelon



Contents ·Basic definitions ·Area formula ·The basic nature of the ·Characteristic ·Characteristic ·More results... Basic definitions 　　There is a right angle corner is called a right angle trapezoid trapezoid Translated by Google Area formula 直角梯形 面积公式 直角梯形 面积公式 直角梯形 面积公式 直角梯形 面积公式 直角梯形 面积公式 直角梯形 面积公式 直角梯形 面积公式 　　"On the high end plus Bottom multiplied by 2." 　　Keystone is down two sides parallel quadrilateral shape, you can put it in accordance with a diagonal into two identical high triangle triangle area formula is "high-end multiplied by 2", so the trapezoid is: "Take on the bottom high by 2 "+" Bottom multiplied by 2 high "=" on the high end plus Bottom multiplied by 2. " Translated by Google The basic nature of the 直角梯形 基本性质 　　Two parallel does not equal the end, two waist is not parallel nor equal, a waist corners are right angles. Translated by Google Characteristic 直角梯形 具有特征 直角梯形 具有特征 直角梯形 具有特征 　　In the trapezoidal abcd, ad / / bc, ∠ b = 90 °, then ∠ a = 90 °, ∠ c + ∠ d = 180 °. Translated by Google Characteristic 直角梯形 具有特征 　　In the right angle trapezoid ABCD in, AD / / BC, ∠ B = 90 °, then ∠ A = 90 °, ∠ C + ∠ D = 180 °. 　　Important properties: 　　Trapezoidal ramp at right angles to the waist to waist midpoint equidistant from two endpoints Translated by Google