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= (76 x 14) - (22 x 14) = 1064 - 308 = 756
26. 1/4 luas lingkaran =1/4 x 3,14 x 40 x 40 = 3,14 x 40 x 10 = 3,14 x 400 = 1.256
27. volume= p x l x t
9000 = p x 18 x 20
9000 = p x 360
p= 9000:360
p = 25
t. t = 28
r = 14
s.a = 28
s.b = 48
luas trapesium = 1/2 x (s.atas + s.bwh) x t
---> 1/2 x ( 28 + 48 ) x 28
---> 1/2 x 76 x 28
---> 38 x 28
---> 1064
luas 1/2 lingkaran = 1/2 x n.r²
---> 1 22
---- x ------ x 14²
2 7
---> 1 22
----- x ------- x 196 (196 : 7 = 28)
2 7
---> 1 1
----- x 22 . 28 = ----- x 616.
2 2
---> 308
luas bangun = luas trapesium - luas 1/2 lingkaran.
luas bangun = 1064 - 308 = 756 (c)
note : / atau --- = per , t.t = tinggi trapesium , r = jari" , s.a = sisi atas trpesium , s.b = sisi bwh trpesium.
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