Question

Figure I shows a piece of triangular cardboard ABC with sides 8 cm, 10cm, 12cm. D is a point on AC such that 13 years ago

Answer 1

for A)... find angle BCD

Answer 2

then what can you do to find a side of a triangle if you know all three angles and one side length?

Answer 3

@kryton1212

Answer 4

part a ii

Answer 5

sine formula?

Answer 6

How did you get (a) (i) to be 55.8 deg?

Answer 7

cos<ACB= (12^2+8^2-10^2)/(2*12*8)

Answer 8

Ok, I got 55.771...
Law of cosines.
That's good.

Answer 9

Since you now have m<ACB, and you know m<CBD = 30, you can get m<BDC

Answer 10

peter did u change ur picture

Answer 11

Then with m<BDC and the opp side of 8 cm, you can use the law if sines to get CD using its opp angle of 30 deg.