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30. p² = d² - (R+r)²
p² = 29² - (22+18)²
p² = 841 - (40)²
tinggal di hitung saja
29. 21/AD = 70/50
= 21/AD = 7/5
= 7AD = 105
AD = 105/7
AD = 15 cm (c)
30. akar dari 29 kuadrat - (11+9) kuadrat
= akar dari 29 kuadrat - 20 kuadrat
= akar dari 841 - 400
= akar dari 441
= 21 cm (c)