Area of first rectangle = 4*3=12 Area of second rectangle = 7*8=56 Area of third triangle is 1/2*bh=1/2*3*8=12 Now add all the three 12+12+56=80 So area is 80 square cm
Part A.) is 39 because 13+7= 20+4=24+4=28+3=31 and I'm assuming that side that doesn't have a number is 8 so your final answer would be 39 I basically gave you part b but word it differently. Don't say that your assuming that one side is 8. I hope I helped if i did Mark me as brainliest .
