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Oksanka [162]
3 years ago
11

Help ASAP going school soon

Mathematics
1 answer:
katen-ka-za [31]3 years ago
7 0
Answers:
____________________________________
<span>
Angle B:  81°</span> .
____________________________________
<span>
Angle C:  99°</span> .
____________________________________
<span>
Angle D:  81°</span> .
_____________________________________________
<span>
Explanation:</span>
_______________________________________________________
<span>
Angle B:</span>
_______________________________________________________
Given:  m∡A = 99° ;

 ∡A and ∡B are "supplementary angles" ;
                          and supplementary angles add up to 180°.
_______________________________________________________
<span>      → So, m∡B = 180 − 99 = 81° </span>.
_______________________________________________________
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° .
<span>______________________________________________________</span>
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