Trigonometri
PR/sin Q = QR/sin P
10/sin 45° = 12/sin P
sin P = 12/10 × 1/2 √2
sin P = 3/5 √2
cos P = √(1 - sin² P) = √(1 - 18/25) = 1/5 √7
sin P + cos P
= 3/5 √2 + 1/5 √7
= 1/5 (3√2 + √7)
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Trigonometri
PR/sin Q = QR/sin P
10/sin 45° = 12/sin P
sin P = 12/10 × 1/2 √2
sin P = 3/5 √2
cos P = √(1 - sin² P) = √(1 - 18/25) = 1/5 √7
sin P + cos P
= 3/5 √2 + 1/5 √7
= 1/5 (3√2 + √7)