One side of an isosceles triangle is 5 cm long. Another side is 13 cm long.
How long is the third side?
Select one option, then click Submit.
5 cm
7 cm
12 cm
13 cm
more information required
Select an option, then submit.
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
Primary Mathematics Challenge 2002 (2002)
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →Primary Mathematics Challenge 2002 (2002)