AB = 6 cm, AC = 12 cm Calculate the length of CD.
Give your answer to 3 significant figures.
C
12 cm
55°
А
D
B 6 cm

12.7cm

Step-by-step explanation:

there are 2 triangles , triangle ABC and triangle BCD

use Pythagoras theorem for triangle ABC to find the line BC

let BC = h

12^2=6^2+h^2

making h the subject

h=

h =

so line BC is

for triangle BCD, there's an angle 55 degrees

sin theta = opposite/hypotenuse

where BC is the opposite

theta which is the angle = 55

note h = CD

in 3 s.f ,h= 12.7cm

step-by-step explanation:

false

step-by-step explanation:

rulers and compasses arent required in order to bisect an angle because when bisecting angles, you're making a "half circle" and considering in order to bisect an angle it wouldn't be straight, you wouldn't need either of the two