Question 1 of 10 · 0 correct so far
Difficulty: Medium
Short answer
A triangle has a perimeter of 20 cm. Two sides are 7 cm and 8 cm. How long is the third side?
Fractions like 1 1/2, 9/6 and 3/2 are all accepted where they're equal.
Hints unlock after your first attempt — pick or type an answer to start the ladder.