one (1) The window of the city library is semicircle above, and a rectangle 1.6 meters high and 1.2 meters wide below. What's the area of this window? (the number is reserved for 2 decimal places) elder brother and elder sister, please (2) How many meters does it take to decorate the border of this window 2. Dad gave a round table bread at home with 3.768 meters long color bar (ignoring the joint). How many square meters is the area of this round table?
1. (1) s = 1.6 * 1.2 + 3.14 * (1.2 / 2) & sup2 / 2 = 2.49m2
(2) L = (1.6 + 1.2) * 2-1.2 + (2 * 3.14 * 1.2 / 2) / 2 = 6.28m
That is 6.28 meters
2.R=3.768/(2*3.14)=0.6
S = 3.14 * 0.6 & sup2; = 1.1304 M2