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properties of kites this is the only question in this section. question…

Question

properties of kites
this is the only question in this section.
question
find the measure of angle y.
answer
attempt 1 out of 2
additional solution
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Explanation:

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\(\angle Y = 100^{\circ}\))。

Answer:

\(100^{\circ}\)