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17 Oct 2020, 10:30
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Difficulty:
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79% (01:05) correct
21%
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wrong
based on 58
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Find the number of degrees in angle 1 if AB = AC, DE = DC, angle 2 = 40°, and angle 3 = 80°.
(A) 90
(B) 80
(C) 60
(D) 50
(E) 40
Attachment:
2020-10-17_21-15-39.png [ 68.82 KiB | Viewed 1752 times ]
17 Oct 2020, 12:00
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as DEC is given as an isosceles triangle, angle DEC = angle ECD =50 ( as 3 is 80)
CAB is an isosceles triangle too , so CAB =ACB =40,
40 + angle 1 +ECD = 180
angle 1 =90
CAB is an isosceles triangle too , so CAB =ACB =40,
40 + angle 1 +ECD = 180
angle 1 =90
