In RST, RS = 7, RT = 10, and ST = 8. Which angle of RST has the smallest measure? A T BCANNT BE DETERMINDED C R D S

Correct answer is option A. T

Step-by-step explanation:

Given that

In a , RS = 7, RT = 10, and ST = 8.

To find:

Smallest angle = ?

Solution:

We can use cosine rule here to find the angle.

Formula for cosine rule:

Where  

a is the side opposite to

b is the side opposite to

c is the side opposite to

Using the cosine rule:

Now, let us use Sine rule to find other angles:

Smallest angle is

Correct answer is option A. T

5

step-by-step explanation: