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06 Dec 2018, 04:24
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D
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Difficulty:
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94% (01:10) correct
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In the figure above, the area of △ABC is 35. What is the length of DC?
A. 5
B. 6
C. 7
D. 8
E. 9
Attachment:
triangle.jpg [ 11.06 KiB | Viewed 3272 times ]
06 Dec 2018, 05:10
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Bunuel
from given figure we can find base ; 0.5* BC* 7= 35 , we get it as 10
the triangle BDC is of 3:4:5 ratio as side DC would be 8 IMO D
anshkool4u
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Concentration: Finance, Operations
Schools: IIMA PGPX'23 (A)
GMAT 1: 710 Q50 V36
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WE:Business Development (Retail Banking)
06 Dec 2018, 05:28
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InTriangle ABC, Base= BC, height = 7, Area =35.
Thus, Area = 1/2 *BC*7=35
BC=10.
Now, In triangle BDC, BC^2=DC^2 +BD^2
10^2= DC^2+ 6^2
DC^2= 100-36=64
DC= 8
Hence answer D
Thus, Area = 1/2 *BC*7=35
BC=10.
Now, In triangle BDC, BC^2=DC^2 +BD^2
10^2= DC^2+ 6^2
DC^2= 100-36=64
DC= 8
Hence answer D
