Question

find the area of a triangle with sides of length 7 and 9 and included angle 72 degree.

Answer 1

the height if going to have something to do with the sin of 72

Answer 2

side1*side2*sin 72 / 2

Answer 3

is that really an included angle?

Answer 4

the right angle no
just the 72

Answer 5

so 38.52

Answer 6

an "included angle" is one the is nestled inbwteen the side lengths mentions

Answer 7

this is what you gave us in your information

Answer 8

yea ... i drew it wrong i thought it was a triangle since it said find the area of a triangle

Answer 9

:) then "height" can be regarded as 7sin(72) ; a base as 9

area tri = hb/2 = 9*7sin(72)/2

Answer 10

so height 6.66

Answer 11

wait know i am confused

Answer 12

now*

Answer 13

\[1/2 \times7\times9\times \sin 72 = 29.95828026 \approx 30\]

Answer 14

so that is how you do it?

Answer 15

yes .. half x 1st side x 2nd side x sine the angle included between them :)