The first term of an arithmetic progression is 61 and the second term is 57.
The sum of the first n terms is n. Find the value of the positive integer n.
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Answer:
From the given information, we can compile following data for Arithmetic Progression (A.P);
The expression for difference in Arithmetic Progression (A.P) is:
For the given case;
Expression for the sum of number of terms in the Arithmetic Progression (A.P) is:
For the given case;
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Answer:
Perimeter of trapezium = 104 m
Length of Non-parallel sides = 18 m and 22 m
Altitude = 16m
Area of Trapezium = 0.5 * (sum of parallel sides)*altitude ------ (1)
Sum of parallel sides = Perimeter - (sum of non-parallel sides) = 104 m - (18+22)m = 104-40 m = 64 m
From (1), Area of Trapezium = 0.5*64*16 = 512 m^2
Ans: Area of trapezium = 512 m^2
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