Question

Which of the following side lengths do NOT form a right triangle?
A. 5 cm, 12 cm and 13 cm
B. 8 cm, 15 cm and 17 cm
C. 9 in, 40 in and 41 in
D. 20 in, 21 in and 28 in

Answer 1

follow this guideline:

a+b>c
b+c>a
a+c>b

Answer 2

but for a right triangle, you would test the pythagorean method

Answer 3

a^2+b^2=c^2

This is the Pythagorean theorem. Can you figure that out for me?

Answer 4

should i try out all the angles ? @Jamierox4ev3r

Answer 5

it would be good so that you can make sure your answer is correct

Answer 6

mention my name when you have the answer

Answer 7

D. Does 20^2+21^2=28^2
400 + 441 = 841 and 28^2=784
No, not a right triangle
@Jamierox4ev3r

Answer 8

in this case, after you proved that, A. is the correct answer because of the following:

5^2+12^2=169

the square root of 169=13

Therefore, 5^2+12^2=13^2

Answer 9

Does that make sense?

Answer 10

not really @Jamierox4ev3r

Answer 11

5^2=25
12^2=144

144+25=169
169=13^2

Therefore,
12^2+5^2=13^2

Answer 12

all of this proves that the above triangle is a right triangle indeed

Answer 13

so i can but A for the answer @Jamierox4ev3r

Answer 14

A. Does 5^2+12^2=13^2
25 + 144 = 169 and 13^2=169
Yes, right triangle

B. Does 8^2+15^2=17^2
64 + 225 = 289 and 17^2=28
Yes, right triangle

C. Does 9^2+40^2=41^2
81 + 1600 = 1681 and 41^2=1681
Yes, right triangle

D. Does 20^2+21^2=28^2
400 + 441 = 841 and 28^2=784
No, not a right triangle

@Jamierox4ev3r

Answer 15

oh idk what i was thinking for some if you are talking which is not a right triangle, the answer would be D. lol sorry

Answer 16

im slacking off srry :)) and thank you for pointing out my mistake

Answer 17

thanks yay ! (: @Jamierox4ev3r

Answer 18

anytime just keep up the great work and DFTBA (don't forget to be awesome)!