Answer:
b= 69
Step-by-step explanation:
total inside angles = 900
because (7-2)*180 = 900
plus them all and set it = 900
you will get b= 69
Fun fact
An apple, potato, and onion all taste the same if you eat them with your nose plugged
1300 mm = 1.3 m
900 mm = 0.9 m
Area
1.3 * 0.9 = 1.17 m²
