In , with , and . For the acute angle at vertex , which of the following equals…

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

\triangle ABC

\angle B = 90^{\circ}

with

AB = 6\,\text{cm}

BC = 8\,\text{cm}

and

AC = 10\,\text{cm}

. For the acute angle

\theta

at vertex

A

, which of the following equals

\cos\theta

? (a)

\dfrac{10}{6}

(b)

\dfrac{6}{10}

(c)

\dfrac{8}{6}

(d)

\dfrac{8}{10}