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08 Dec 2020, 10:15
Kudos
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
74% (01:07) correct
26%
(00:55)
wrong
based on 23
sessions
History
Date
Time
Result
Not Attempted Yet
In triangle ABC, angle A is three times as large as angle B. The exterior angle at C is 100°. Find the number of degrees in angle A.
(A) 20
(B) 25
(C) 50
(D) 60
(E) 75
(A) 20
(B) 25
(C) 50
(D) 60
(E) 75
Updated on: 08 Dec 2020, 14:38
Originally posted by randomavoidplease on 08 Dec 2020, 10:21.
Last edited by randomavoidplease on 08 Dec 2020, 14:38, edited 2 times in total.
Last edited by randomavoidplease on 08 Dec 2020, 14:38, edited 2 times in total.
Kudos
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Bunuel
Since Angle A + Angle B = Exterior Angle C
Then 4A = 100 Thus A = 25. A =3*25 Thus E .
Edited:
08 Dec 2020, 11:09
Kudos
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answer is e ) 75
exterior angle = 3x+ x = 4x
4x = 100
x=25 , so a = 3*25 =75
exterior angle = 3x+ x = 4x
4x = 100
x=25 , so a = 3*25 =75
