# Thread: The other acute angle of triangle

1. ## The other acute angle of triangle

Problem says: A triangle has two acute angles. One angle is 25 degrees, so what is the other acute angle?

--I'm not sure what to do here.....would I just subtract 25 from 90?

Also, how would I figure out if it is possible to have a triangle with sides 5, 7, and 12?

--I think it's possible but I'm not sure if I'm correct...I just added 5 & 7 and got 12...so that means the side with length of 12 would connect between sides of 5 & 7.

2. ## Acute angles

I wonder if you mean right triangle?

There are quite a few possibilities if all you know is one angle is 25 degrees and another is less than 90 degrees.

You wonder:
"Also, how would I figure out if it is possible to have a triangle with sides 5, 7, and 12"

Cut three paper strips of length 5, 7, and 12 inches.
See if you can make a triangle of it.
Again, I wonder if you mean a right angle?

Bye.

3. Neither of the problems specify that the triangle is a right triangle.

I don't have a ruler...I'm out of town

4. To determine if 3 given lengths can be the sides of a triangle, remember this rule:

The sum of the lengths of any two sides of a triangle must be greater than the length of the remaining side.

5. soooo, because the sides i added up, 5 & 7 are equal to the 3rd side, 12, it's not a triangle?

6. Originally Posted by beetz
soooo, because the sides i added up, 5 & 7 are equal to the 3rd side, 12, it's not a triangle?
that's right, you just get an amazing straight line