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2 years ago

What is the length of DE in the right triangle below ?

Mathematics

2 answers:

NeTakaya2 years ago

5 0

Answer: The length of DE is (B) 25 units.

Step-by-step explanation: As shown in the given figure, ΔDEF is a right-angles triangle, where ∠DFE = 90°, DF = 15 units and EF = 20 units.

We are to find the length of DE.

ΔDEF is right-angled at ∠DFE.

So, using Pythagoras theorem, we have

$DE^2=DF^2+EF^2\\\\\Rightarrow DE^2=15^2+20^2\\\\\Rightarrow DE^2=225+400\\\\\Rightarrow DE^2=625\\\\\Rightarrow DE^2=25^2\\\\\Rightarrow DE=25.$

Therefore, the length of DE is 25 units.

Thus, (B) is the correct option.

olganol [36]2 years ago

3 0

B.25
sorry if my writing is not clear

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