Question

What is the length of the unknown side of the right triangle? (1 point)

A right triangle with hypotenuse x and legs 21 and 20
A)21
B)29
C)400
D)441

Answer 1

Answer:

B)29

Step-by-step explanation:

${x}^{2} = {21}^{2} + {20}^{2}$

${x}^{2} = 441 + 400$

${x}^{2} = 841$

$x = \sqrt{841}$

$x = 29$

Answer 2

Answer:

B

Step-by-step explanation:

Using Pythagoras' identity

The square on the hypotenuse is equal to the sum of the squares on the two legs, that is

x² = 21² + 20 ² = 441 + 400 = 841 ( take square root of both sides )

x = $\sqrt{841}$ = 29 → B