• Best of luck to the class of 2025 for their HSC exams. You got this!
    Let us know your thoughts on the HSC exams here

practice exam help? (1 Viewer)

H

hscishard

Active Member
Joined
Aug 4, 2009
Messages
2,031
Location
study room...maybe
Gender
Male
HSC
2011
Existential said:
AM I CRAZY???????

this question does not work!

Q3ai

Triangle ABC has sides AB=3cm, BC=6cm and CA=5cm.

Use the cosine rule to show that Angle BAC = 94 degrees.

I keep getting a negative answer - HELP!
Click to expand...
Existential said:
the cosine rule is getting me a negative answer!!!

and i need "sinC" before i can do area of triangle!!!
Click to expand...
I hate people that can only use calculators, AND can't use them properly.

(9+25 -36)/ (2x5x3)
=-1/15
Shift cos, angle is approx 93.82
 
You must log in or register to reply here.

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top