Question

in the following right angled triangle find the length of the unknown side​

Answer 1

the length of unknown side is 5cm. (DF)

Step-by-step explanation:

DF^2 = DE^2 + EF^2 (Pythagoras theorem)

DF^2 = 4^2 + 3^2

DF^2 = 16 + 9

DF^2 = 25

DF = √25

DF = 5 cm

Answer 2

Step-by-step explanation:

Using Pythagoras theorm

${a}^{2} + {b}^{2} = {c}^{2}$

${4}^{2} + {3}^{2} = {c}^{2} \\ 16 + 9 = {c}^{2} \\ 25 = {c}^{2} \\ c = \sqrt{25} \\ c = 5$

The length of the unknown side is 5 cm

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