Triunghiurile echilaterale ABC și BCD sunt situate în plane diferite, iar E este mijlocul
laturii BC. Demonstrați că BC 1 (ADE).(dau coroana )​

11.2

step-by-step explanation:

when doing tangent the tangent of the angle is equal to the opposite side from the angle over the adjacent side to the angle.

tan43 = x / 12

move 12 over by multiplying each side by 12

12tan43 = x

x = about 11.2

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

d is the only accurate one

step-by-step explanation:

step-by-step explanation:

there's the chart