**Theorem:-Let a it is in the an initial term and also d be the common difference of one AP. Then its nth term and general ax is given by `a_n=a+(n-1)d`**

**If the 8th term of an AP is 31 and the 15th hatchet of an AP is 16 much more than the 11th hatchet . Discover the AP.You are watching: What is the lateral area of a square pyramid with side length 11.2**

**Theorem: The sum of nth terms of an AP with very first term a and common difference d is `S_n=n/2(2a+(n-1)d)`**

**The sum of first 6 terms of an arithmetic progression is 42. The proportion of that 10th term to its 30th hatchet is `1:3`. Calculation the very first and 13th term of an AP.**

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