If a triangle has sides of lengths 5, 8 and 12, it is a right triangle. true or false

False.

Step-by-step explanation:

To see if these sides can form a right triangle, all we need to do is see if the following equation holds where is the larger measurement.   it doesn't really matter which you assign as 5 or 8.

So I'm choosing the following .

has to be 12 because 12 is the largest.

Now we got to see if holds.

That is, we need to see if holds.

That's totally false.  89 is definitely not 144 so 5,8, and 12 cannot be put together to form a right triangle.

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)