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2.) 21 = 3 BC
BC = 21 :2
BC = 7 cm = Z
sudut BAC = sudut BCA
= 180 - 52
= 128 <- jumlah sudut BAC dan BCA
masing masing sudut BAC dan BCA adalah
= 128 : 2
= 64 derajat
ini karena ΔABC = Δ sama kaki
3.) QR = 1/2 PQ - 3 cm
QR = (1/2 x 18) - 3
QR = 9 - 3
QR = 6 cm
4.) 2x = 70 derajat
x = 70 : 2
x = 35 derajat
jd sudut xwz = 35 derajat
5.) x = 45 derajat
karena 2x membentuk sudut 90 derajat. jadi 1 x = 90 : 2 = 45 derajat