1 / 13

Introduction to Geometry

Introduction to Geometry. The students will find the perimeter of a rectangle. Mr. Nelson. Parallel. Two lines that stay the same distance apart at all times. 7 yd. 20 yd. 20 yd. 7yd. Rectangle. Four sided object All angles are 90˚ Opposite sides are equal in length. 13 in. 4 in.

ian-frank
Télécharger la présentation

Introduction to Geometry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to Geometry The students will find the perimeter of a rectangle Mr. Nelson

  2. Parallel • Two lines that stay the same distance apart at all times.

  3. 7 yd 20 yd 20 yd 7yd Rectangle • Four sided object • All angles are 90˚ • Opposite sides are equal in length 13 in 4 in 4 in 13 in

  4. 8 yd 8 yd 8 yd 8 yd 7 in 7 in 5 cm 5 cm 5 cm 7 in 7 in 5 cm Square • A rectangle • What makes it a rectangle? • A special rectangle • All sides are equal

  5. 12 cm 12 cm P = 48 cm 12 cm 4 m 12 cm P = 8.5 m 2.5 m 2 m Perimeter • The distance around the outside of a shape. 2.5 mi 7 mi P = 19 mi 7 mi 2.5 mi

  6. 26 ft. P = 88 feet 26 ft. Finding Perimeter • Annette measured the perimeter of her garden and wrote the dimensions down on a piece of paper. Part of the paper was torn off leaving only the perimeter and length. • Perimeter – 88 feet • Length – 26 feet • What is the width?

  7. 26 ft. P = 88 feet 26 ft. Finding Perimeter • Perimeter – 88 feet • Length – 26 feet • What is the width of the garden? • First, understand the problem?

  8. 26 ft. P = 88 feet 26 ft. Understand • What do we know? • The perimeter is the length of all the sides added up. • We know the perimeter is 88 feet • We know the length is 26 feet • We know we need to find the width using what we know.

  9. 26 ft. P = 88 feet 26 ft. Consider Options • Use a formula • Write and solve an algebraic expression • Subtract and divide • Guess and check

  10. 26 ft. P = 88 feet 26 ft. Choose an Option • I choose to use subtraction and division • I am comfortable with it • I can use algebra to check my answer

  11. 26 ft. P = 88 feet 26 ft. Work the Plan • The perimeter is the length of all the sides added up. • Subtract what we are given. • The two unknown sides add up to 36 feet. • The two unknown sides are equal. • Divide 36 by 2

  12. 26 ft. P = 88 feet 26 ft. Does it make sense? • The perimeter is the length of all the sides added up. • Use algebra with x as the variable for the unknown side • Solve for x • Yes it does make sense.

  13. Solution • The width of Annette’s garden is 18 feet.

More Related