All categories

3 years ago

In a triangle ABC, AB = 7, AC = 8, BC = 3, what is cos(A)?

1 answer:

6 0

Use the cosine rule.
c=AB=7
b=AC=8
a=BC=3
a^2=b^2+c^2-2bc(cos(A))
=>
cos(A)=(b^2+c^2-a^2)/(2bc)
=(7^2+8^2-3^2)/(2*7*8)
=13/14
=0.9286

You might be interested in

Taj has a choice of water, iced tea, or lemonade; with lemon or lime twist; served in a small or large glass. how many more choi

shusha [124]

Answer:

Total number of choices with a straw: 12

Total number of choices without a straw: 12

Total number of choices: 24

Step-by-step explanation:

Taj has a choice of:

water, iced tea, or lemonade (3 options)

with lemon or lime twist (2 options)

served in a small or large glass (2 options)

This made a total of 3*2*2: 12 different choices

if the drink can be served with or without a straw, he choices are doubled, making a total of 2*12 = 24

5 0

3 years ago

Which one should I choose?

Nastasia [14]

Given:

A figure of a quadrilateral.

To find:

The measures of angle 1 and angle 2.

Solution:

The given figure has two pairs of congruent adjacent sides. So, the quadrilateral in the figure is a kite.

We know that the diagonals of a kit are perpendicular to each other at the point of intersection.

$m\angle 1=90^\circ$

According to the angle sum property, the sum of all interior angles of a triangle is 180 degrees.

$90^\circ+65^\circ+m\angle 2=180^\circ$

$155^\circ+m\angle 2=180^\circ$

$m\angle 2=180^\circ-155^\circ$

$m\angle 2=25^\circ$

Therefore, the correct option is C.

7 0

3 years ago

If B = A , where on the number line will B appear ?

Wittaler [7]

B is going to be where A is

7 0

3 years ago

Read 2 more answers

Two vertices of a rectangle are shown. If AC is a diagonal of the rectangle, and two other vertices of the rectangle, B and D, l

blondinia [14]

Answer:

You post the MCP problems here? Lol

Step-by-step explanation:

haha

ill tell mr aram someday ;p

5 0

3 years ago

Which number is greater . 84 or 9.3

tatuchka [14]

I think the answer is 9.3, but I’m not sure

3 0

3 years ago

Read 2 more answers