Warm-up 2/11/15 1)Given the set of blue lines are parallel and that the red line is a transversal find the following measures and then state how you know:

Warm-up 2/11/151) Given the set of blue lines are parallel and that

the red line is a transversal find the following measures and then state how you know:a) If m∠1 = 108° what is m∠3?b) If m∠8 = 13° what is m∠7?c) If m∠2 = 63° what is m∠6?d) If m∠8 = 46° what is m∠2? 2) Give a congruence statement for the following:

Announcements 2/11/151) Homework 5.1 and 5.2 must be handed into the

tray by the end of the period.2) CM #26 today and retake CM #25.3) I will be issuing detentions, so check missing

homework.4) Unit quiz will be on Friday the 20th.5) Extra 3% on test for anyone that brings in a

large Kleenex box. (Limit: 1 per person)6) Homework Questions?



5.3 Congruent Polygons and Circles

Congruent polygons are polygons that have three properties:1) Same number of sides.2) Corresponding sides are congruent.3) Corresponding angles are congruent.Ex #1 Are these polygons congruent?These two shapes have the same number of sides.Their corresponding sides are congruent since

Their corresponding angles are congruent since

Writing congruent polygon statements:To say these two triangles are congruent we need to write it so the corresponding sides and angles are in the correct order.Since we can see that angle B corresponds to angle E and angle C corresponds to angle F and angle A corresponds to angle D then we need to write the letters in this order:

△BCA ≅△EFD

Ex #2 Write a congruence statement for the following shapes:

Ex #3△ABC ≅△DCB



Announcements 2/17/151) Homework 5.3 Due Thursday2) CM #24 on Wednesday.3) CM #27 on Thursday4) Unit quiz will be on Friday the 20th.5) Extra 3% on test for anyone that brings in a

large Kleenex box. (Limit: 1 per person)

Cont of 5.3 Congruent Polygons and Circles

TheoremsTheorem 5.10 The sum of the measures of the angles of any triangle is 180°.Theorem 5.11If two angles of one triangle are congruent to two angles of another triangle, then the third angles are also congruent.Theorem 5.12The acute angles of a right triangle are complementary.

Ex#4 Find the missing angle measure.

Ex #5 Find the x.

Ex#6 Find x.

Ex #7

If you have a quadrilateral, how many triangles can you break this into?

So what would be the total angle measure of a quadrilateral?Total angle measure = 180° * 2Total angle measure = 360

Ex#8 What would be the total angle measure of a pentagon?What would one angle of a regular pentagon be?

Angle measure of a regular n-gon = 180(n -2)/nEx #9 You are wanting to make a (late) valentines card for the love of your life. You want it to be a regular octagon like you saw in the store. What angle should each angle of the octagon be so your card is a perfect regular octagon?

Warm-up/Review for CM’s 2/18/151) Given the set of blue lines are parallel and that the red line is

a transversal find the following measures and then state how you know:a) If m∠1 = 108° what is m∠3?b) If m∠8 = 13° what is m∠7?c) If m∠2 = 63° what is m∠6?d) If m∠8 = 46° what is m∠2? 2) a) Give a congruence statement for the following:

b) Write 6 congruence statements for the angles and sides of each triangle.

3) a) What is the total angle measure for a heptagon? b) What would be one angle measure of a regular heptagon? (You must use the formula for each!)

Warm-up/Review for CM’s 2/19/151) a) Sketch a nonagonb) Make line segments that go from vertex to

vertex but do not overlap. How many triangles is the nonagon broken into?

c) What is the total angle measure for a nonagon?d) What would be one angle measure of a regular

nonagon? (You must use the formula for each!)

Announcements 2/19/151) Homework 5.4 Due Tuesday.2) Unit quiz will be on Friday the 20th.3) Extra 3% on test for anyone that brings in a

large Kleenex box. (Limit: 1 per person)

Group-workHere’s the deal:

1) Come grab slips of paper and 12 tacks. 2) In your group you will try to order the statements

and reasons given to you in the correct order.3) You will then pin the papers to the wall.4) This is not bases on speed, but rather correctness.

Extra credit on last Unit Quiz-3 pts for correct proof. -2 pts for 1 minor error. -1 pt for 2 minor errors.Your group will be DQ’ed if you look at another groups proof or if you share info with another group or if a group member is not contributing

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Warm-up 2/11/15 1)Given the set of blue lines are parallel and that the red line is a transversal find the following measures and then state how you know: