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这是一道图形题(不知道怎么把图贴上来) In the figure shown, what is the value of x ?
(1)The length of line segment QR is equal to the length of line segment RS.
(2)The length of line segment ST is equal to the length of line segment TU.
-------------------------------------------------------------------------------------------------------------------------------------------------------- 【答案】C
【思路】
(1) QR=RS 不能判斷x
(2) ST=TU 不能判斷x
(1)+(2) RSQ=RQS && TSU=SUT
SUP=x+TSU(这是怎么推导出来的啊?)
SQP=x+RSQ
SUP+SQP=180+x
QPU+180+2x = 360 (四邊形內角和) 2x=90, x=45 |
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