Question

126. The sum of the first five terms of an arith- metic sequence is 150 and the sum of the first ten terms is 530.
i) What is the third term of the sequence ?
ii) What is the eighth term?
iii)what is the first three terms of the sequence?
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Answer 1

Step-by-step explanation:

Length of fence of trapezium ABCD=AB+17+48+40

⇒120=105+AB

⇒AB=15 m

Area of trapezium

=

2

1

×Sum of Parallel sides×Distance between Parallel sides

=

2

1

[(40+48)×15]=660 sq. metres