1.
a2 + b2 + c2.Means leg (a2) + leg (b2) = the hypotenuse
2.
12 cm side is A and the 5 cm is B.
We need to find C.
C2=A2+B2
C2=12cm2+5cm2
C2=144cm2+25cm2
C2=169cm2
Now you have to find the square root.
Answer - 13 cm2
3.
To find if it is right triangle it must apply a2+b2=c2.
8cm - a
6cm - b
11cm - c
c2=a2+b2
c2=8cm2+6cm2
c2=642+362
c2=100cm2
Square root 100.
= 10
No it is not a right triangle.
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