Question 295068
c<sup>2</sup> = a<sup>2</sup> + b<sup>2</sup>
13<sup>2</sup> = 5<sup>2</sup> + b<sup>2</sup>
169 = 25 + b<sup>2</sup> [subtract 25 from both sides]
144 = b<sup>2</sup>
12cm = b 

The perimeter is 5 + 12 + 13 = 30cm