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x + 2y = 2 | . 1
--------- -
4x + 2y = 14
x- 2y = 2
-------- -
3x = 12
x = 12 / 3
x = 4
2 . L = 1/4 . phi. diameter
1386 = 1/4. 22/7. d
1386 * 4* 7 / 22 = d
126 * 14 = 1764
x + 2y = 2
==> x2 ==> 4x + 2y = 14
==> x1 ==> x + 2y = 2
----------------- -
3x = 12
x = 12/3 = 4
2. Luas lingkaran = π . r²
1386 cm² = 22/7 . r²
1386 . 7/22 = r²
441 = r²
21 = r
r = jari - jari
diameter = 2r = 2(21) = 42 cm