Correct option is D
Given:
Two sides of a triangle: 7 cm and 8 cm
Included angle: 60°
Formula Used:
Cosine Rule (Law of Cosines):
where a, b, c are the sides
Solution:
a = 7, b = 8, C = 60∘
Using cosine rule;
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Question
The lengths of two sides of a triangle are 7 cm and 8 cm respectively and the measure of the angle included between these two sides is 60°. The length (in cm) of the third side of the triangle is :
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