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16. <ACB = <AEB - <EBC = 84 - 52 = 32
17.
a+ b = 85
b =a+25
..............(+)
2b = 110
b = 55, a = b - 25 = a = 55-25 = 30
a= 30 dan b = 55
18. K = 4x26 + 1/2 keliling lingkaran dgn r = 14
K = 104 + 1/2 (2)( 22/7)(14)
K = 104 + 44
K = 158
21. r lingkaran = 22 + 6 = 28 cm
n = 7 putaran
Jarak = n xkeliling = n ( 2 π r )
J = 7 x 2x 22/7 x 28
J = 1.232 cm
22. Luas = sudut pusat / sudut keliling x luas ling dgn r 21
L = 40/360 x 22/7 x 21 x 21
L = 1/9 x 66 x 21
L = 154