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https://vle.mathswatch.co.uk/images/questions/question15325.png

 May 26, 2020
 #1
avatar+109741 
+1

You are just meant to use the Pythagorean theorem.

 

Is that enough info?  

What does Pythagoras's theorem say?

 May 26, 2020
 #2
avatar+359 
0

It says that a^2+b^2=c^2

 May 26, 2020
 #3
avatar+109741 
+1

Well it says that if and only if a triangle is right-angled, then the square on the hypotenuse (the longest side) is equal to the sum of the squares on the other two sides

 May 26, 2020

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