Answer:
Obtuse.
Step-by-step explanation:
Yes a triangle can be made as 7 + 5 > 9.
Test for an acute triangle:
For acute triangle c^2 < a^2 + b^2 where c is the longest side.
For right triangle c^2 = a^2 + b^2 where c is the longest side.
For obtuse triangle c^2 > a^2 + b^2 where c is the longest side.
Here:
9 ^2 = 81 = c^2
5^2 + 7^2 = 25 + 49 = 74 = a^2 + b^2.
- so the triangle is not acute.
Here c^2 > a^2 + b^2 therefore the triangle is Obtuse.
