A.25° | B.40° | C.25°或40° | D.不能确定 |
1 |
2 |
A.40° | B.50° | C.60° | D.70° |
A.140° | B.80°或100° | C.100°或140° | D.80°或140° |
A.1 | B.2 | C.3 | D.4 |
A.三内角之比为1:2:3 |
B.三边长的平方之比为1:2:3 |
C.三边长之比为3:4:5 |
D.三内角之比为3:4:5 |
A.b2=c2-a2 | B.a:b:c=3:4:5 |
C.∠C=∠A-∠B | D.∠A:∠B:∠C=12:13:15 |
© 2017-2019 超级试练试题库,All Rights Reserved.