Question

Look at attached picture please.

Answer 1

how did you get tathat @cwrw238

Answer 2

its a right angled triangle so by the pythagoras theorem
a^2 + b^2 = 4^2 - sorry its 4^2 not 4^3

a^2 + b^2 = 16
a + b = sqrt18 - thats given

Answer 3

you can now solve for a and b and plug the values into the are formula

Answer 4

hold on - i think theres an easier way
a^2 + b^2 = 16..............................(1)
(a + b)^2 = 18
a^2 + b^2 + 2ab = 18....................(2)
subtract (1) from (2):

2ab = 2

Answer 5

Sorry I have to leave for exam

Answer 6

ok