Question

in a triangle ABC angle A=40 and angle B=57 and side c is 30 cm find angle C

Answer 1

i got the angle C its 83

Answer 2

find the length of a and b

Answer 3

@ALLTehMaffs

Answer 4

law of sines

\[\frac{a}{\sin A} = \frac{c}{\sin C}\]
\[\frac{b}{\sin B} = \frac{c}{\sin C}\]

Answer 5

a=19.47 b=25.41

Answer 6

correct?

Answer 7

I got b=25.35 , which is really close so I dunno what's up

Answer 8

how about a?

Answer 9

that one I got the same

Answer 10

er, I got 19.43

Answer 11

find the area of the triangle?

Answer 12

what?

Answer 13

i dnt understand

Answer 14

I did it wrong, 1 sec.

Answer 15

herons law?

Answer 16

are you there?

Answer 17

Area of triangle = 1/2 (Base)(Height) = (1/2) (c)(h)

Make right triangle with b as hypotenuse to find the height, h

SORRY
\[h=b \cos A\]

\[Area=\frac{1}{2}ch\]
\[ = \frac{1}{2}c(b \cos A)\]