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2 years ago

15

What is the value of a?

2 answers:

kirill [66]2 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]2 years ago

5 0

Answer:

A=60

Step-by-step explanation:

Add 28+20+12

A=60

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