In a right angled triangle we can use Pythagoras theorem to determine third side in case two sides are given.
The formula of Pythagoras theorem is given by:

Where x , y and z are sides of triangle , z is hypotenuse.
Now we use this formula to find hypotenuse.
Plugging other two sides which are 5 in. and 12 in.



Taking square root on both sides
square root of 169 is 13
so we have z=13
Hypotenuse is 13 inches.
Multiply 80 miles by 4 hours to get 320 miles for 4 hours.
So the area of one triangle is (3.5 x 9 ) 31.5 , times that by 4 gives us 126 , now add that to 7 squared which is 126 + 49 . the answer is 175 cm^2<span />
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