Answer:
Step-by-step explanation:
[tex]c^{2} = a^{2} + b^{2}[/tex]
Red area = [tex]c^{2}[/tex]
One blue triangle = ( a * b * [tex]\frac{1}{2}[/tex] )
Blue area = 4 * ( a * b * [tex]\frac{1}{2}[/tex] )
Totally area = [tex](a+b)^{2}[/tex]
Red area + blue area = totally area
[tex]c^{2}[/tex] + 4 * ( a * b * [tex]\frac{1}{2}[/tex] ) = [tex](a+b)^{2}[/tex]
