Question

9. The mathematical statements of the parallelogram law is called
a) Sine law
b) cosine law
c) triangle law
d) polygon law

Answer 1

Answer:

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Answer 2

(b). The mathematical statements of the parallelogram law are called "Cosine law".

Explanation:

Cosine law:

• The Law of Cosines is used to find the remaining components of an oblique (non-right) triangle when the lengths of two sides and the measure of the included angle (SAS) or the lengths of three sides (SSS) are known.
• The Law of Cosines is a mathematical formula that expresses how two integers relate to each other. $c^{2}=a^{2}+b^{2}-2abcosC$
• The cosine formulas using the law of cosines are,

• $cos A = (b2 + c2 - a2) / (2bc) cos B = (c2 + a2 - b2) / (2ac) cos C = (a2 + b2 - c2) / (2ab)$