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Nataly [62]
3 years ago
15

Find the value of a.

Mathematics
2 answers:
Sergeeva-Olga [200]3 years ago
7 0

Answer:

mthway

Step-by-step explanation:

math*

shusha [124]3 years ago
3 0

= 81° + a° + a° = 180° ( angle sum property )

81° + 3a = 180° \\ 3a = 180 - 81 \\ 3a = 99 \\ a =  \frac{99}{3} \\ a = 33°

The three angles of this triangle are :

\:  ∠1 \:= 81° \\ \:  \: ∠2 = 2a = 2 \times 33 = 66° \\ ∠3 = a = 33 \\  \\ ∴ \: a = 33° \:

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