anonymous
  • anonymous
How do I find the missing side of an isosceles triangle if A=42 and B=42. How do I find C? A. 42° B. 69° C. 74° D. 132°
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
did you leave something out?
anonymous
  • anonymous
mathstudent55
  • mathstudent55
In a triangle, if two sides are congruent, then the opposite angles are congruent. This can be restated as: The base angles of an isosceles triangle are congruent.

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mathstudent55
  • mathstudent55
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mathstudent55
  • mathstudent55
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anonymous
  • anonymous
So m
mathstudent55
  • mathstudent55
The sum of the measures of the 3 angles is 180 deg. x + x + 42 = 180
aric200
  • aric200
A triangle must=180Deg
mathstudent55
  • mathstudent55
No. m
aric200
  • aric200
If
aric200
  • aric200
I am going to put in in simple terms. O kay
anonymous
  • anonymous
Thank you @aric200 ! :)
mathstudent55
  • mathstudent55
2x + 42 = 180 2x = 138 x = 69

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