Can you calculate the blue area without calculator? | (Fun Geometry) |

[@pullojo59]

Please why did you multiply 5/2√5 by √5/√5

[@MathandEngineering]

Yes sir it's always advisable to bring roots at the top, to make solving easier thats why when ever you have a root as a denominator you just multiply the whole fraction by another fraction, with both the denominator and the numerator equal to the root in the original fraction, let's say if you multiply by 1/√a by √a/√a it will be √a/a But multiplying by √a/√a will not change the value because √a/√a = 1 So it is as good as multiplying by 1 I hope the explanation is clear but Please if it isn't clear enough, just tell me, I'll reexplain, than you sir

[@STEAMerBear]

In American classrooms we call this step rationalizing the denominator. Sometimes a clever choice is required to accomplish that such as using the complement of an irrational sum to give a difference of squares.