AB = EF
AB = 18 cm
CO = AD
CO = 12 cm
CB = VCO^2 + OB^2
= V12^2 + 9^2
= V144 + 81
= V225
= 15 cm
5.
Tentukan nilai x dan y pada gambar.
jawaban :
gambar (i)
x + 128 o = 180 o
x = 180 o - 128 o
= 52 o
y + 110 o = 180 o
y = 180 o - 110 o
= 70 o
gambar (ii)
x = 85 o (apabila kita geser maka nilainya sama)
y + 70 o + 85 o + 125 o = 360 o
y + 280 o = 360 o
y = 360 o 280 o
y = 80 o