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30-01-2021
Mathematics

contestada

(4 Points)
Here is a triangle
Angle PQR= 120°
PQ= 6 CM
QR= 9 CM Work out the length PR

Respuesta :

30-01-2021

Answer:

Step-by-step explanation:

You know the lengths of two sides and the angle between them. Use the Law of Cosines to solve the triangle.

PR^2 = 6^2 + 9^2 - 2*6*9*cos(120°)

= 36 + 81 - 108(-0.5)

= 13

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