Find out missing number from the following question.

Every quarter of a circle has numbers. By adding these numbers and taking out the square of that number, gives the number written in that quarters square.

5 + 7 = 12; and 12 x 12 = 144

3 + 7 = 10; and 10 x 10 = 100

6 + 7 = 13; and 13 x 13 = 169

8 + 9 = 17; and 17 x 17 =289

Hence the answer will be 289