*A tangent is:*

*-a line that touches a circle at exactly one point*

*-the point where the line touches the circle is called the point of*

*tangency*

We also learned how to use the tangent chord relationship to find the unknown lengths, given in the diagrams. We used the

*Pythagorean theorem (only if there's a right triangle)*.for example:

-find the length of AB (if BC (diameter) is 14 cm, and AC (hypotenuse) is 20 cm)

solution:

Then we learned how to determine angle measures in a circle with a tangent line.

-find the measure of angles A,B,C

*To find A*

*180°=A+42°+90°*

*180°-132°=A*

*48°=A*

*To find C*

*Since C, is subtended by the same arc as A, A could be divided by two, then you'll get 24° for C.*

*To find B. (A+B=diameter(which is always 180°)*

*A+B=180°*

*48°+B=180°*

*B=180°-48°*

*B=132°*

After those two examples, we had another example using the tangent chord relationship, once again.

-find the measure of line DE

solution:

**Today's homework are:**

**-10.3 textbook**

**-read**

**-CYU #2**

**-Practice (odd)**

**-Apply : ALL**

**-Extend 19&21**

**-Workbook, and Extra Practice**

**-journal**

**TEST ON FRIDAY**

*For Tuesday, June 1*

*hand in inside stash-its*

*-problems of the week (#3, and another)*

*-journal*

*-last test signed*

## 2 comments:

Great scribe Angela! Nice pictures and great use of colours. Thanks for putting up stash-it homework.

Check your drawings for subtended angles....

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