Explanation

Using the cosine rule, we have p² = q² + r² − 2qrcosP p² = 8² + 6² − 2(8)(6)(1/12) = 64 + 36 − 8 p² = 92∴ p = √9cm

Using the cosine rule, we have p² = q² + r² − 2qrcosP p² = 8² + 6² − 2(8)(6)(1/12) = 64 + 36 − 8 p² = 92∴ p = √9cm