(a) Use a Riemann sum with m = n = 2 to estimate the value of the sin(x + y) dA R where R = [0, π] × [0, π]. Take the sample points to be lower left corners. (Round your answer to three decimal places.)

4.9361

Step-by-step explanation:

Rieman sum = ∫∫ΔA

ΔA = ΔxΔy

Δx =  = = pi/2 = Δy

ΔA =  pi/2 * pi/2 =

Evaluating at the four corners

=

= 2

∫∫ΔA = 2 *  = = 4.9361

step-by-step explanation:

use pothagarean therom

a^2+b^2=c^2 so first ac

acm is a right triangle because c= 90°

and am (the hypotenuse or c) =16+9 =25

but there is not enough info we need another angle or side length

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)