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luas = r2 * 1/4
= 8*8/4
= 16cm2
20. 12+9+15+4+4+4+11+12+9 = 80 cm
21. a+5 + 2i+5 = 110
a + 2i = 100
a - 3 + i - 3 = 58
a + i = 64
a+2i = 100
a+i = 64
__________-
i = 36 (umur 5 tahun mendatang)
a+36 = 64
a = 38 (umur 5 tahun mendatang)
umur sekarang = ayah = 38-5 = 33
ibu = 36-5 = 31