C and E are right triangles
To figure this out, use the Pythagorean Theorem.
a^2+b^2=c^2
A. 5,6,7
5^2+6^2=7^2
25+36=49
61=49
Not a right triangle
B. 6,8,14
6^2+8^2=14^2
36+64=196
100=196
Not a right triangle
C. 8,15,17
8^2+15^2=17^2
64+225=289
289=289
Right triangle
D. 10,12,15
10^2+12^2=15^2
100+144=225
224=225
Not a right triangle
E. 15,20,25
15^2+20^2=25^2
225+400=625
625=625
Right triangle
