风筝 定义
A kite is a planar convex quadrilateral consisting of two adjacent sides of length a and the other two sides of length b that are congruent. It is notable that the diagonals of a kite are perpendicular. The rhombus is a special case of the kite, and the lozenge is a special case of the rhombus. Below is an example of a kite.
区域
风筝的面积由 A = 1⁄2 pq 给出，其中 p = √ a2 - h2 + √ b2 - h2 和 q = 2h 是多边形对角线（垂直）的长度。边缘比率为 120-90-60-90 的风筝 √ 3 < /span> : 1 是被称为 polykite 的类似多米诺骨牌的物体的基础。
来源
“Kite.” From Wolfram MathWorld, mathworld.wolfram.com/Kite.html.
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