marykatbousman2 marykatbousman2

24-06-2017
Mathematics

contestada

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

Respuesta :

mathmate mathmate

25-06-2017

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

Answer Link

Otras preguntas

Munson's Sporting Goods purchases bowling balls from the manufacturer for a whole sale price of $50 each.There is a 60% mark up when they sell the bowling balls

What is the definition of RNA?

The best way to find keywords for a cover letter and resumé is to __________. a. use a dictionary or thesaurus b. review the job posting and descriptions of s

2y-4=3y-5 find the y

1. With aging populations, families may need to care for older family members. How might this affect the structure of the family? 2. What are some of the facto

Declining skill or fitness level from taking a break from exercise is formally referred to as A.progression B.specificity C.overload D.reversibility

If an excess of sulfric acid reacts with 23.0 grams of sodium chloride how many grams of hydrochloric acid are produced? 2H2SO4 + 4NaCI -> 2H2SO4 + 4HCI

Yoga is a form of exercise that can have positive spiritual health benefits, true or false?

how can you pull a rope with equal but opposite forces

Information gathered from observing the growth of a fish over a month is called a. data. b. inferences. c. variables. d. hypotheses.