Could someone help me please ?

Mathematics

1 answer:

jeyben [28]3 years ago

5 0

Answer: 12.66

Step-by-step explanation:

Use pytagoras to find CB

AB= 6 cm

CA=12 cm

CB²=CA²-AB²

CB²=12²-6²

CB²=144-36

CB=√108

CB=6√3

Using formula for sinα=CB/CD

α=55°

sin55°=6√3/CD

CD=6√3/sin55°

CD= 6*1.73/0.82=10.38/0.82=12.66

You might be interested in

(cos2a *cos 4a+ sin 2a*sin 4a)/sin4a

lyudmila [28]

Answer:

Step-by-step explanation:

(cos 4a*cos 2a+sin 4a*sin 2a)/sin 4a

=[cos (4a-2a)]/sin 4a

=(cos 2a)/sin 4a

=(cos 2a) /(2 sin 2a cos 2a)

=1/(2 sin 2a)

=1/2 csc 2a

4 0

3 years ago

If line a is perpendicular to line b and the slope of line a is 7 whats the slope of line b

amm1812

Answer:

If a line is perpendicular to another line, that means that the slope is completely opposite that of the original line. The first thing that we do to the slope is we negate the number which means that if we have a slope of $-7$ our slope because $7$ in this step. In our case our slope is $7$ so in this step it becomes $-7$ .

Moving onto the second part which is to get the reciprocal of the number which means that if we have $\frac{1}{2}$ then we would switch it to $2$ . In our case our number is $-7$ so we would make that into a fraction like this $-\frac{1}{7}$ .