Question

!!!!!HURRY!!!!!!
Bethany used the steps below in an attempt to solve for angle B in triangle ABC.


Where is bethanys error?

Answer 1

Answer:

B) Bethany took the square root of each squared term before isolating cosB and solving for B

Step-by-step explanation:

got it right on edge :)

Answer 2

The measure of angle B in triangle ABC is 63.9°. Hence, Bethany has done a mistake in step 2.

Given that, in the triangle ABC, AC=4.1 cm, AB=4.5 cm and BC=2.7 cm.

We need to find the measure of angle B.

What is the trigonometric function to find the angle in the triangle?

The trigonometric function to find the angle in the triangle is b²=a²+c²-2ac cosB.

Now, (4.1)²=(4.5)²+(2.7)²-2×4.5×2.7 cosB.

⇒16.81=20.25+7.29-24.3 cosB

⇒16.81-27.54=-24.3 cos B

⇒cos B=0.44

⇒B=63.9°

The measure of angle B in triangle ABC is 63.9°. Hence, Bethany has done a mistake in step 2.

To learn more about the angles of a triangle visit:

https://brainly.com/question/27682397.

#SPJ2