Question

What is cosD, in simplest form?

a. 3/5

b. 3/4

c. 4/5

d. 5/3

Answer 1

a. 3/5

Explanation:

Trig ratio:

`\mathsf{cos(\theta)=(adjacent \ side)/(hypotenuse)}`

Given:

• angle = D
• side adjacent to angle = 15
• hypotenuse = 25

`\mathsf{\implies cos(D)=(15)/(25)=\frac35}`

Answer 2

`\sf cos(D) = (3)/(5)`

using the cosine formula:

`\sf cos(x) = (adjacent)/(hypotenuse)`

solve:

`\hookrightarrow \sf cos(D) = (15)/(25)`

simplified:

`\hookrightarrow \sf cos(D) = (3)/(5)`