According to the pattern shown below, how many circle(s) is / are there from the 1st to the 198th symbol counting from the left? ○ △ □ ○ △ ○ △ □ ○ △ ○ △ □ ○ △…
It is known as the lengths of shorter sides for a right-angled triangle are 9cm and 12cm respectively. Find the length of the longest side in centimeter.