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03 May 2021, 20:00
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C
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:
85% (00:30) correct
15%
(00:22)
wrong
based on 39
sessions
History
Date
Time
Result
Not Attempted Yet
03 May 2021, 20:11
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In △ABC, what is ∠A?
(1) △ABC is an isosceles triangle.
∠A can still vary even if it is not one of the two angles that make the triangle isosceles.
∠A-∠B-∠C:
30-75-75
90-45-45
INUSFFICIENT.
(2) ∠B=90°
30-90-60
60-90-30
INSUFFICIENT.
Together 1 and 2.
45-90-45
is the only possibility.
SUFFICIENT.
Answer C.
(1) △ABC is an isosceles triangle.
∠A can still vary even if it is not one of the two angles that make the triangle isosceles.
∠A-∠B-∠C:
30-75-75
90-45-45
INUSFFICIENT.
(2) ∠B=90°
30-90-60
60-90-30
INSUFFICIENT.
Together 1 and 2.
45-90-45
is the only possibility.
SUFFICIENT.
Answer C.
03 May 2021, 20:57
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Bunuel
Question: ∠A=?
Statement 1: △ABC is an isosceles triangle.
No measure of any angle in triangle hence
NOT SUFFICIENT
Statement 2: ∠B=90°
We can't determine other angles based on just one angle and no other property of triangle hence
NOT SUFFICIENT
Combining the statements
∆ABC is an isosceles triangle (two angles are same) and angle B = 90o
i.e. Angles can be 90-90-0 (NOT POSSIBLE) or 90-45-45 (POSSIBLE)
i.e. Angle A = 45o
SUFFICIENT
Answer: Option C
