Given right triangle ABC with right angle C and cos A= 1/3, which of the following expressions is also equal to 1/3? a. sinB
b. sin(90°-A)
c. sin(90°-B)
d. Both A and B are correct

D

Step-by-step explanation:

So we know that:

To co-function identities state that:

Therefore, this is the same as:

B is correct.

Additionally, recall that in a right triangle, the two other angles must add up to 90. In other words:

Subtract A from both sides:

So we can make the substitution:

Thus, A is also correct.

The correct answer is D .

Step-by-step explanation:

This is how you would proceed:

Centered at D, draw an arc of 7m (3.5cm) within the garden (rectangle).

Centered at B, draw an arc of 4m (2cm) within the garden.

There will be two intersection points, one is outside the garden (that you will not see), and the other is within the garden, which is where the tree should be planted.

See illustration attached.