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Nomor 18
SU² = 12² + 9²
SU² = 144 + 81
SU² = 225
SU = √225
SU = 15 cm
Nomor 19
D² = 12² + 5²
D² = 144 + 25
D² = 169
D = √169
D = 13 cm
Nomor 20
t² = 15² - 9²
t² = 225 - 81
t² = 144
t = √144
t = 12 cm