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BrainlyAvenger
As we know that the sum of two sides of a triangle is greater than the third side ...

Option A is correct because 4+5=9>8

Option B is correct because 9+12=21>15

Option C is correct because 12+5=17>13

Hope it helps.....
asra44
A. 5^2+4^2=41
8^2=64
64 doesn’t =41 therefore triangle A isn’t a right angle
B.9^2+12^2=225
15^2=225
225=225 therefore triangle b is a right angle
C.5^2+12^2=169
13^2=169
169=169
Therefore triangle C is a right angle.


Hope this helps

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