I don't know how to answer number 9 and 10. Can someone please help me?

AB = AC = 32

SR = TR = 7

Solution:

Question 9:

Tangent theorem of a circle:

Lengths of tangents drawn from an same external point to a circle are equal.

In figure AB and AC are tangents drawn from same an external point A.

By tangent theorem of a circle,

⇒ AB = AC

Divide both side of the equation by x.

Divide by 2 on both side of the equation.

Substitute x = 4 in AB and AC.

Question 10:

By tangent theorem of a circle,

⇒ SR = TR

Multiply by 7 on both side of the equation, we get

Divide by y on both side of the equation, we get

Substitute y = 7 in SR and TR