The two sides of the triangle are 5cm. and 7 cm. The angle between us is 60 degrees to find the 3 side of the triangle.
| June 9, 2021 | education
To determine the length of the BC side, we use the cosine theorem for triangles.
BC ^ 2 = AB ^ 2 + AC ^ 2 – 2 * AB * AC * CosBAC.
BC ^ 2 = 7 ^ 2 + 5 ^ 2 – 2 * 7 * 5 * Cos60 = 49 + 25 – 70 * 1/2 = 74 – 35 = 39.
BC = √39 cm.
Answer: The length of the third side is √39 cm.
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