一个圆的周长是18.84分米,这个圆的半径是______.
18.84÷(2×3.14),
=18.84÷6.28,
=3(分米);
答:这个圆的半径是 3分米.
故答案为:3分米.
His invention ____ of no use by the scientists of that time. [ ]
A. considered being
B. considered to be
C. was considered to be
D. was considered being
万能角度尺可以测量0°~360°的任何角度。