Pythagoras’ theorem is a statement that is true for ... Add the squares together to get the value of \(c\)². Square root the value of \(c\)² to get the value of \(c\). ST is the length from ...

Substitute the values of a, b and c into Pythagoras’ theorem to give 2² + 4² = \(c\)². 4 + 16 = 20 To find the value of \(c\), calculate the square root of 20 This gives the final answer of ...