Question

Which of the following sets of numbers could be the side lengths of a right triangle? 3, 4, and 7
9, 40, and 42
8, 15, and 16
20, 21, and 29

Answer 1

use pythagorean theorem

$a^2+b^2 =c^2$
where c is the long side

if you substitute in the numbers into this equation, then the right triangle is the numbers where this equation is true

Answer 2

Answer:  20, 21, 29

Step-by-step explanation:

a^2 + b^2 = c^2

20^2 + 21^2 = 29^2

400 + 441 = 841

841 = 841 this statement is true