Homework

Pg. 371 #1(b,d), 2(b,c), 3, 4(b,c), 5(a,e), 11

Habitat for Humanity: Making sure everyone has a decent place to live

Geometry & Measurement Unit (Chp. 7)

Video

Open Question

House built for refugees in Trincomali, Sri Lanka in 2002 & 2003

Drawing of Habitat for Humanity Basic House

The project manager has put you in charge of constructing a lamp post for the roof

Review

Isoceles Triangle

Right-angle Triangle

Scalene Triangle

RuleThe 3 interior angles of a trianglealways add up to 180°

Review

180°

60°?

60° + ? = 180°

Review

60°120°

60° + 120° = 180°

Review

Scenario 1

You are given 2 interior angles and are asked to find the exterior angle of the 3rd corner

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

?

110°50°

Method 1

?

110°50°

50° + 110° + a = 180°50° + 110° + 20° = 180°

20°

Interior AnglesStep 1

a

Method 1

110°50°

Exterior Angle

20° + ? = 180°20° + 160° = 180°

20°160°

Interior Angles

50° + 110° + ? = 180°50° + 110° + 20° = 180°

Step 1 Step 2

Method 2

110°50°

50° + 110° = 160°

An exterior angle equals the sum of the other two interior angles

Rule

160°

Scenario 2

You are given 2 exterior angles and are asked to find the exterior angle of the 3rd corner

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

?

65°

125°

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

65°

125°

All exterior angles of a triangle add up to 360°Rule

65° + 125° + ? = 360°65° + 125° + 170° = 360°

170°

Scenario 3

You are given a triangle with 2 sides of equal length

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

110°

?a b

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

110°

A triangle with 2 equal side lengths will have 2 equal anglesRule

?a b

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

110°

110° + a + b = 180°110° + 35° + 35° = 180°

?a b

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

110°

110° + a + b = 180°110° + 35° + 35° = 180°

?35°35°

a b

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

110°

?35°35°

a b

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

110°

35° + ? = 180°35° + 145° = 180°

?35°35°

a b

If you wanted to attach a horizontal pole to the roof where the people can hang a lamp, what angle would you need to

measure?

110°

35° + ? = 180°35° + 145° = 180°

145°35°35°

a b