Application of Trigonometry

MM

Mashaal Masha

Dec 18, 2022

Choose the correct options for the following questions.

In $\triangleABC$ if $\beta=90^{\circ}$, then according to law of cosine the value of the square of the side b is defined as:

Difficulty: Easy

A:

b^{2}=a^{2}+b^{2}-2ab

B:

b^{2}=b^{2}+b^{2}-2bc\cos\beta

C:

b^{2}=a^{2}+c^{2}

D:

b^{2}=a^{2}+c^{2}+2ac\cos\beta

In $\triangleABC$ if$\alpha=90^{\circ}$ then according to law of cosine the value of the square of the side a is defined as

Difficulty: Easy

A:

a^{2}=b^{2}+c^{2}

B:

a^{2}=a^{2}+c^{2}+2ac

C:

a^{2}=b^{2}+c^{2}+2bc\cos\alpha

D:

a^{2}=b^{2}+c^{2}-2bc\cos\alpha

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