Question

Does 7,20,21 ​form a right triangle

Answer 1

7,20,21 does form a right triangle because the right triangle having these side lengths is sometimes called the 3,4,5 triangle and 7,20,21 is a part of the divisors

Answer 2

No

Explanation:

You need a 90 degree angle to form a right triangle, as well as two other angles with the sum of 90 to be equivalent to 180 degrees.

Hope this helps!