3.
如图,在?ABCD中,AD=4cm,AB=2cm,则?ABCD的周长是( )
| A. | 12cm | B. | 10cm | C. | 8cm | D. | 6cm |
2.在?ABCD中,∠D、∠C的度数之比为3:1,则∠A等于( )
0 282274 282282 282288 282292 282298 282300 282304 282310 282312 282318 282324 282328 282330 282334 282340 282342 282348 282352 282354 282358 282360 282364 282366 282368 282369 282370 282372 282373 282374 282376 282378 282382 282384 282388 282390 282394 282400 282402 282408 282412 282414 282418 282424 282430 282432 282438 282442 282444 282450 282454 282460 282468 366461
| A. | 45° | B. | 135° | C. | 50° | D. | 130° |