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luas belah ketupat = d1 x d2 : 2 = 32 x (44 - 20) : 2 = 32 x 24 :2 =
768 : 2 = 384 cm2
luas seluruhnya = 320 + 384 cm2= 704 cm2 (b)
26. 45/360 x 3,14 x 20 x20 = 1/8 x 3,14 x 20 x 20 = 157 cm2 (d)