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no 6.

tan 60° = 9cm/KL
√3 = 9/KL
KL = 9/√3
di rasionalkan
9/√3 × √3/√3 = 9√3/3 = 3√3. a

no 5.

tan 45° = AB/BC
tan 45° = AB/5
1 = AB/5
AB = 5

Cos 45° = BC/AC
cos 45° = 5/AC
1/2√2 = 5/AC
AC = 5 per 1/2√2
AC = 10/√2
dirasionalkan
10√2 × √2/√2 = 10√2/2 = 5√2.

jawaban C