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27 Jun 2022, 04:15
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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:
69% (01:05) correct
31%
(01:11)
wrong
based on 35
sessions
History
Date
Time
Result
Not Attempted Yet
In an isosceles triangle ABC, if the measure of angle A is 70°, which of the following could be the measure of angle BCA?
I. 40°
II. 55°
III. 70°
(A) Only I
(B) Only III
(C) Only I and II
(D) Only II and III
(E) I, II and III
I. 40°
II. 55°
III. 70°
(A) Only I
(B) Only III
(C) Only I and II
(D) Only II and III
(E) I, II and III
27 Jun 2022, 08:02
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Don't fall into the trap in this question, that is, do not discount the fact that the other angle may not be 70 degrees.
If one angle is 70, then yes, the other MAY be 70, which means that III is possible, if the other angle is indeed 70, then the remaining (third) angle will be 180-70-70 = 40, so I is also possible.
But what if neither of the other angles are 70? Well if one angle is 70, and the other is 55, then the other must be 55 in an isosceles triangle.
55+55 = 110 + 70 =180, therefore, 55 is possible as well.
So I, II, and III could all be true
If one angle is 70, then yes, the other MAY be 70, which means that III is possible, if the other angle is indeed 70, then the remaining (third) angle will be 180-70-70 = 40, so I is also possible.
But what if neither of the other angles are 70? Well if one angle is 70, and the other is 55, then the other must be 55 in an isosceles triangle.
55+55 = 110 + 70 =180, therefore, 55 is possible as well.
So I, II, and III could all be true
27 Jun 2022, 10:51
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The possible measures of the other two angles are
70 and 40 or
55 and 55
Since you're free to choose which of the above is assigned to BCA, any one of the three works
Posted from my mobile device
70 and 40 or
55 and 55
Since you're free to choose which of the above is assigned to BCA, any one of the three works
Posted from my mobile device
27 Jun 2022, 12:07
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Isosceles triangle has two equal sides, so two equal angles.
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