“The surest way not to fail is to determine to succeed”. --Richard Brinsley Sheridan

Do NowO Take out a protractor and your compass. *If

you don’t have a compass, see if you can borrow from someone in another class. You will not be able to share during the test.

O Turn in your test corrections from unit 1. (ES bin)

O Turn in anything you are missing from unit 2. (ES bin)

O Put your notebook in the bin so I can do a notebook check. (your class period bin)

TestingO http://www.youtube.com/watch?v=

yPDOgpfKLuo

Problem Solver ChallengeO Hidden in each of the sentences are the numbers 1 to 10 in

words.For example 'My parents told me to never cross the road without looking.' contains the number 1: 'My parents told me to never cross the road without looking.'

O The robins love hiding amongst the smooth reeds.It's always worth looking after your friends, even if they've upset you.Even heavyweight boxers like using soft tissues when they have a cold.To avoid the calf, I veered sharply to the left.The eggs were boxed thirteen instead of a dozen in each baker's delivery box.Having salmon every day for lunch gets a little boring after a while.The attendance at the local football match exceeded last weeks by many thousands.We need to waterproof our boots to make sure we don't get wet.Meeting friends after work allows executives to network effectively.The orchestra sounded magnificent with the three virtuosi xylophonists.

Intro to Unit 3

Triangle sum theoremO The sum of the interior angles of any

triangle is equal to 180 degrees.O Let’s use it!

Classifying triangles by their angles

O AcuteO All three angle measures are less

than 90o.O Right

O One of the angle measures is exactly 90o.

O ObtuseO One of the angle measures is greater

than 90o

Classifying triangles by their side lengths

O EquilateralO All three sides are congruent.

O IsoscelesO Two of the sides are congruent.

O ScaleneO No congruent sides.

Classify this triangleO By angles?O AcuteO By side lengths?O Equilateral

Classify this triangleO By angles?O ObtuseO By side lengths?O Isosceles

Classify this triangleO By angles?O Right O By side lengths?O Scalene/Isosceles

Classify this triangleO By angles?O Acute O By side lengths?O Scalene

Classify this triangleO By angles?O AcuteO By side lengths?O Isosceles

Classify this triangleO By angles?O Right O By side lengths?O Scalene

Classify this triangleO By angles?O Acute O By side lengths?O Equilateral

Classify this triangleO By angles?O AcuteO By side lengths?O Isosceles

Classify this triangleO By angles?O AcuteO By side lengths?O Isosceles

Equilateral trianglesO Equilateral—Congruent sidesO Equiangular—Congruent anglesO In triangles, equilateral triangles are

also equiangular

Today’s objectivesO Use the triangle sum theorem and

the exterior angle theorem to find the measures of missing angles.

O Classify a triangle as equilateral, isosceles, or scalene, and as acute, right or obtuse.

O Explain the relationship between an equiangular triangle and an equilateral triangle

Practice

1. Explain the relationship between an equiangular triangle and an equilateral triangle 2. Classify this triangle 3. Classify this triangle

4. Find the measure of angle C.

Problem solver challenge O Four adventurers (Mike, Angela,

Lorraine and Teddy) need to cross a river in a small canoe.

O The canoe can only carry 100kg. O Mike weighs 90kg, Angela weighs

80kg, Lorraine weighs 60kg and Teddy weighs 40 kg, and they have 20kg of supplies.

O How do they get across?