Perhatikan gambar berikut. Nilai cos p=.....

Bab Trigonometri
Matematika SMA kelas X

PR = V (3v13)^2 - 9^2
= V 9.13 - 81
= V117 - 81
= V36
= 6 cm.

Cos P = PR/PQ
= 6/3V13
= 6/3V13 x V13/V13
= 6V13 / 3.13
= 6V13 / 39
= 2V3 / 13
= 2/13 V3 (E)
Semoga membantuuu