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= 1/6 (3,14. 20)
= 10,47 cm
b) JA = 120/360 x (πd)
= 1/3. (3,14.20)
= 20,93 cm
c) <JEA =180-60
= 120
d) <JSN = 1/2 <JN
= 1/2. 180
= 90
e) <ASN = 1/2 < AEN
= 1/2. 60
= 30
f) <JSA = 1/2 < JEA
= 1/2. 120
= 60
g) JEA = 120/360 πr²
= 1/3. 3,14. 10²
= 104,67 cm²
h) AEN = 60/360 πr²
= 1/6. 3,14. 10²
= 52,3 cm²
i ) <AEN/<JEA = 60/120
= 1/2
j) <AEN/JSA = 60/60
= 1/1
k) AN/JA = 10,47/ 20,93
= 1/ 2
l) AEN/JEA = 52,3 / 104,67
= 1 / 2
m) sama dgn perbandingan sudut