3 years ago

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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