Using process of elimination and Pythagora's Theorem, find which of the smaller sides, when their squares are found equal to the largest number squared.
The sum of any two sides of a triangle must be greater than the length of the third side. The only choice that fits this requirement is 3 cm, 4 cm, 5 cm.
1/5 because there are 7 numbers divisible by 5 from 1 to 35. 5,10, 15, 20,25,30,35, and out of those there are 35 cards, 7 out of 35 or 7/5 can be simplified to 1/5.
