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18 Jan 2019, 00:18
Kudos
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
83% (00:56) correct
17%
(01:44)
wrong
based on 40
sessions
History
Date
Time
Result
Not Attempted Yet
What is the length of AD in the figure above?
A 3√5
B 3√3
C 8
D 8√3
E 9√2
Attachment:
2019-01-18_1116.png [ 8.1 KiB | Viewed 2243 times ]
Archit3110
Major Poster
18 Jan 2019, 06:48
Kudos
Bookmarks
Bunuel
BC = 8
so side of base = 8-5 = 3
apply phythogerous
6^2 +3^2 = sqrt 45
IMO A 3√5
19 Jan 2019, 00:49
Kudos
Bookmarks
Pythagorean triples to know are 3-4-5 and 5-12-13
Recognise that 6-8-10 is double 3-4-5
The bottom edge of the large triangle is 8.
8-5=3
\(3^2+6^2=h^2\)
9+36=\(h^2\)
h=√45
h=√(9·5)
h=√9·√5
h=3√5
Recognise that 6-8-10 is double 3-4-5
The bottom edge of the large triangle is 8.
8-5=3
\(3^2+6^2=h^2\)
9+36=\(h^2\)
h=√45
h=√(9·5)
h=√9·√5
h=3√5
