问题详情

If the lengths of two of the sides of a triangle are 9 and 10, which of the following could be the length of the third side？ Ⅰ. 1 Ⅱ. 11 Ⅲ. 21
A．None
B．Ⅰ only
C．Ⅱ only
D．Ⅰ and Ⅱ only
E．Ⅰ, Ⅱ, and Ⅲ请帮忙给出正确答案和分析，谢谢！