按照圖畫出所示圖形,求剖面線區(qū)域的面積。()

A.275.4914
B.275.4194
C.275.4491
D.275.4419
按照圖畫出所示圖形,求剖面線區(qū)域的面積。()

A.1067.3530
B.1067.3435
C.1067.3345
D.1067.3350
按照圖畫出所示圖形,求角度A的數(shù)值。()

A.55.9180
B.55.9801
C.55.9108
D.55.9081