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Question
properties of kites
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question
find the measure of angle y.
answer
attempt 1 out of 2
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Step1: 四边形内角和
四边形内角和为\(360^{\circ}\),即\(\angle Z+\angle Y +\angle W+\angle I=360^{\circ}\)。
Step2: 利用等腰三角形性质
由图可知\(\angle Z=\angle I\),设\(\angle Z = \angle I=x\)。
Step3: 代入角度计算
已知\(\angle W = 72^{\circ}\),\(\angle Y = 100^{\circ}\),代入内角和公式得\(x + 100^{\circ}+72^{\circ}+x=360^{\circ}\),即\(2x+172^{\circ}=360^{\circ}\),\(2x=360^{\circ}-172^{\circ}=188^{\circ}\),\(x = 94^{\circ}\),但这里我们要求\(\angle Y\),题目中已明确\(\angle Y = 100^{\circ}\)(可能是对图形性质理解,在风筝形(Kite)中,若两邻边相等,根据图形标注直接可得\(\angle Y = 100^{\circ}\))。
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\(100^{\circ}\)