Equilateral triangle ABC has side length 840. Point D lies on the same side of line BC as A such that BD I BC. The line l through D parallel to line BC intersects sides AB and AC at points E and F, respectively. Point G lies on l such that F is between E and G, AAFG is isosceles, and the ratio of the area of AAFG to the area of A BED is 8 : 9. Find AF. D F C В

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
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Two spheres with radii 36 and one sphere with radius 13 are each externally tangent to the other two spheres and to two different planes P and Q. The intersection of planes P and Q is line L. The distance from line L to the point where the sphere with radius 13 is tangent to plane P is m/n, where m and n are relatively prime positive intgers. Find m+n. 

 
Equilateral triangle ABC has side length 840. Point D lies on the same side of
line BC as A such that BD I BC. The line l through D parallel to line BC
intersects sides AB and AC at points E and F, respectively. Point G lies on l
such that F is between E and G, AAFG is isosceles, and the ratio of the area of
AAFG to the area of ABED is 8 : 9. Find AF.
A
l
•G
D
F
C
В
Transcribed Image Text:Equilateral triangle ABC has side length 840. Point D lies on the same side of line BC as A such that BD I BC. The line l through D parallel to line BC intersects sides AB and AC at points E and F, respectively. Point G lies on l such that F is between E and G, AAFG is isosceles, and the ratio of the area of AAFG to the area of ABED is 8 : 9. Find AF. A l •G D F C В
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