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polet [3.4K]
4 years ago
15

Help ASAP plsssss.soon going school

Mathematics
1 answer:
Klio2033 [76]4 years ago
8 0
Answers:
____________________________________

Angle B:  81°
.
____________________________________

Angle C:  99°
.
____________________________________

Angle D:  81°
.
_____________________________________________

Explanation:

_______________________________________________________

Angle B:

_______________________________________________________
Given:  m∡A = 99° ;

 ∡A and ∡B are "supplementary angles" ;
                          and supplementary angles add up to 180°.
_______________________________________________________
      → So, m∡B = 180 − 99 = 81° .
_______________________________________________________
Angle C:  99° .
_______________________________________________________
Explanation:
_______________________________________________________
 Given:  m∡A = 99° .

 ∡A and ∡C are "vertical angles".  Vertical angles are congruent.
______________________________________________________
   → So m∡A = m∡C = 99° .
______________________________________________________
Angle D:  81° .
______________________________________________________
Explanation:
______________________________________________________
   ∡B and ∡D are vertical angles.  Vertical angles are congruent.
   
    As previously determined above,  m∡B = 81° .
______________________________________________________
     → So, m∡D = m∡B = 81° .
______________________________________________________
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