If the ratio of the degree of exterior angle of ∠A,∠B and ∠Cthat are in the triangle ABC is 5:4:3,then the ratio of the degree of ∠A,∠B and ∠C is ( )A、5:4:3 B、3:4:5 C、1:2:3 D3:2:1
若一个多边形的内角和为1080°,则这个多边形的边数为()
如图,△ABC≌△ADE,若∠B=80°,∠C=30°,则∠EAD的度数为()
等于()
已知等腰三角形一边长为4,一边的长为10,则等腰三角形的周长为()
下列运算中,正确的是()