Jawapan

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2016-02-11T11:47:50+08:00
45° = 0.7854 rad
s = r x (sudut dlm rad)
s = 11
11 = r x 0.7854
r = 14
luas
= 1/2 x r^2 x (sudut)
= 1/2 x 14^2 x 0.7854
= 76.97 cm2