55.
sin 5° +sinº 10° + sinº15° +_
+sinº180º =
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Step-by-step explanation:
a=sin5°(5)
d=sin10°-sin5°
=sin5°(5)
an= sin180°(180)
an= 5+(n-1)5
180 =5+5n-5
5n=180
n=36
Sn= n/2{2a(n-1)d}
= 36/2(2*5+36*5)
=18(10+180)
=18*190
Sn=3420
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