5.
如图,在正方形ABCD外作等腰直角△CDE,DE=CE,连接AE,则sin∠AED=( )
| A. | $\frac{1}{2}$ | B. | $\frac{2\sqrt{5}}{5}$ | C. | $\frac{\sqrt{5}}{5}$ | D. | $\frac{\sqrt{10}}{5}$ |
4.
如图,正方形ABCD中,E是BC边上一点,以E为圆心,EC为半径的半圆与以A为圆心,AB为半径的圆弧外切,则tan∠EAB的值是( )
0 309157 309165 309171 309175 309181 309183 309187 309193 309195 309201 309207 309211 309213 309217 309223 309225 309231 309235 309237 309241 309243 309247 309249 309251 309252 309253 309255 309256 309257 309259 309261 309265 309267 309271 309273 309277 309283 309285 309291 309295 309297 309301 309307 309313 309315 309321 309325 309327 309333 309337 309343 309351 366461
| A. | $\frac{\sqrt{3}}{2}$ | B. | $\frac{\sqrt{3}}{3}$ | C. | $\frac{3}{4}$ | D. | $\frac{1}{2}$ |