Mathematics, 22.08.2019 19:30 GamerGirl15

In δabc, a = 2, b = 3, and c = 4. find the value of cosc. is the triangle acute, right, or obtuse?

Answers: 2

Show answers

Answers

Answer from: nikkole11

4^2 = 3^2 + 2^2 - 2 * 3 * 2 * cosC <=> 16 = 13 - 12 * cosC <=> 12 * cosC = -3 <=> cosC = - 1/4.

Answer from: tremainewoodley3030

The applicable formula is known as the law of cosines
C² = a² + b² -2abcosC
cosC = ( a² + b² - c²)/2ab
   =    ( 2² + 3² - 4²)/2*2*3
   = (13-16)/12
   = -3/12
   = -1/4

Answer from: Quest

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

pls mark as brainliest

Answer from: Quest

la parábola es el lugar

geométrico en el cual los puntos tienen una distancia idéntica, equidistantes,

de un punto denominado foco, f, y una recta denominada directriz

el radio vector de una

parábola es el segmento que existe entre un punto cualquiera y el foco.

por la ecuación se observa

que la parábola abre hacia la derecha, por lo cual podemos usar las siguientes fórmulas

la ecuación ordinaria de la

parábola es y^2 = 4px, donde p es la longitud desde el vértice de la parábola al

foco.

la fórmula de la directriz

es x + p = 0

resolviendo:

y^2-9x = 0

y^2 = 9x

4p = 9, entonces p = 9/4

entonces el foco tendrá la

coordenada f(9/4,0)

la directriz vendrá

expresada por

x + p = 0

x = -p

x = -9/4

el problema indica que la

ordenada es igual a 6, entonces

(6)^2=9x

x = 36/9

x = 4

entonces el punto al cual

hay que obtener la distancia será p(4,6)

calculando se tendrá: pf =

pf = 6,25 u

ver más en -

step-by-step explanation:

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 22:50, memester74

Which statement accurately describes how to perform a 90° clockwise rotation of point a (1,4) around the origin?

Answers: 2

continue

Mathematics, 21.06.2019 23:00, maiacheerz

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

Answers: 1

continue

Mathematics, 22.06.2019 00:20, Jaymiegrimes22

Traffic on saturday, it took ms. torres 24 minutes to drive 20 miles from her home to her office. during friday's rush hour, it took 75 minutes to drive the same distance. a. what was ms. torres's average speed in miles per hour on saturday? b. what was her average speed in miles per hour on friday?

Answers: 1

continue

Mathematics, 22.06.2019 00:20, lawrencebenoit7194

❤️ (geometry) does the construction demonstrate how to copy an angle correctly using technology a) yes; the distance between points a and f was used to create circle h b) yes; the distance between points f and g was used to create circle h c)no; the distance between points a and f was used to create circle h d) no; the distance between points f and g was used to create circle h