单选题In quadrilateral ABCD, ∠A+∠C is 2 times ∠B+∠D. If ∠A=70, then ∠B= ______.A60B80C120D240EIt cannot be determined from the information given
单选题
In quadrilateral ABCD, ∠A+∠C is 2 times ∠B+∠D. If ∠A=70, then ∠B= ______.
A
60
B
80
C
120
D
240
E
It cannot be determined from the information given
参考解析
解析:
70+∠C=2(∠B+∠D., 70+∠C+∠B+∠D=360. 2(∠B+∠D.+ (∠B+∠D.=360. (∠B+∠D.=120. It is not possible to find the measure of ∠B.
70+∠C=2(∠B+∠D., 70+∠C+∠B+∠D=360. 2(∠B+∠D.+ (∠B+∠D.=360. (∠B+∠D.=120. It is not possible to find the measure of ∠B.
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