Question

for tha ap pie, pie/2, pie/3......find s15​

Answer 1

Answer:

Step-by-step explanation:

Sn=n/2[2a+(n-1)d]

N=15

a=π

d=a2-a1=π/2-π=-π/2

Sn=15/2[2π+(15-1)×-π/2

Sn=-150π/4