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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 | |