72.

73a. Look at magic triangle in the answer block at left. Write the

formula when r is the unknown quantity.

73a.

b.

Now, assume that y has become the unknown quantity.

Isolate y.

73b. y = sin θ x r

c.

Given the value of y and r, isolate the unknown. Write the

formula in the space below.

74a. Write the function formula for tan θ .

73c.

74a.

b.

Now, place the formula in a magic triangle.

74b.

c.

Look at your magic triangle. Isolate x; write the formula here.

Isolate the unknown when tan θ and x are given.

74c.

d.