Question

pls answer this friends...... ​

Answer 1

Hey mate ,

S3 = N/2 ( 2A +(N-1)D)

180 = 3/2 ( 2A +2×12 )

120 = 2A +24

2A = 96

A = 48 °

Angles = 48° , 48+12 = 60° , 60+12 = 72 °

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