Question

87. Find the sum of the sequence given by 2 + 4 + 6 + 8 + .................+30.

88. A quadrilateral is such that its three sides are equal and angle between these sides are
found to 60°&110°. Find the measure of the largest angle of the quadrilateral.

Answer 1

Step-by-step explanation:

87. a=2,d=2,n=15,Sn=?

Sn=n/2(a+l)

=15/2(2+30)

=15/2(32)

=15×64

Sn=980

Answer 2

87. Answer =240

I hope that it will help you