Which of the following groups of side lengths would not be a right triangle?
a. 0.6, 0.8, 1.0
b. 4√5, 7√5, 8√5
c. 27, 36, 45
d. 5, 5, 5√2
Please help! Thanks x

Question

Which of the following groups of side lengths would not be a right triangle?
a. 0.6, 0.8, 1.0
b. 4√5, 7√5, 8√5
c. 27, 36, 45
d. 5, 5, 5√2
Please help! Thanks x

joemarket · Answer

B. 4√5, 7√5, 8√5.
I used my calculator. 
If we use the pythag. theorem, A^2+B^2=C^2

8√5 is equal to 320, but (4√5)^2+(7√5)^2= 325

anonymous · Answer

Thanks so much! That's what I got too:)

anonymous · Answer

How is D a right triangle? I'm double checking my work, and I'm having trouble proving that one….

joemarket · Answer

Because 5^2+5^2=50, and the square root of 50 is 5√2, which is equivalent to 7.071067812

anonymous · Answer

ahhh.. basic math error. Thanks again!

joemarket · Answer

lol no problem man!