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Marianna [84]
3 years ago
15

What is the value of a?​

Mathematics
2 answers:
kirill [66]3 years ago
6 0

Answer:

3.

Step-by-step explanation:

12a+20a+28a=180(sum of interior angle of a triangle )

or, 60a=180

or, a= 180/60

therefore ..... a=3

Leno4ka [110]3 years ago
5 0

Answer:

A=60

Step-by-step explanation:

Add 28+20+12

A=60

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