Answer:
17cm
Step-by-step explanation:
Use the pythagorean theorem: 8^2+15^2=c^2
64+225
289
sqrt289=17
Your answer is 0.7
0.7 is 7/10 in decimal form.
1st and 2nd pictures are for finding area and 3rd picture is for finding perimeter
hope you understood well and if not and you can ask again