1.

_If E is the spherical excess and R the radius of the earth, the surface area of the triangle, is$?

A. πR²E/90°
B. πR²E/180°
C. πR²E/270°
D. πR²E/360°
Answer» C. ≈ì√ÑR¬¨‚â§E/270¬¨‚àû


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