Download presentation

Presentation is loading. Please wait.

Published byMuriel Wilson Modified over 3 years ago

1
1.7 Introduction to Perimeter, Circumference, & Area Geometry

2
Terminology Perimeter –The total distance (sum of side lengths) around a geometric figure. Circumference –The total distance around the curvature of a circle. Area –The total two dimensional space contained within the boundaries of a geometric figure.

3
Rectangle Perimeter P=2 l +2 w Area A= lw l (length) W (width)

4
Square Perimeter P=4s Area A=s 2 S (side)

5
Triangle Perimeter P=a+b+c Area A= ½ bh b (base) h (height) ac

6
Circle Diameter d=2r Circumference C=2πr Area A=πr 2 diameter r a d i u s ** Always use the π button on the calculator; even when the directions say to use 3.14.

7
Example: Find the perim. & area of the figure. P=2 l +2 w P=2(5in)+2(3in) P=10in+6in P=16in A= lw A=(5in)(3in) A=15in 2 3 in 5 in

8
Ex: Find the perim. & area of the figure. P=4s P=4(20m) P=80m A=s 2 A=(20m) 2 A=400m 2 20 m

9
Ex: Find the perim. & area of the figure. P=a+b+c P=5ft+7ft+6ft P=18 ft A= ½ bh A= ½ (7ft)(4ft) A= ½ (28ft 2 ) A= 14ft 2 7 ft 5 ft 4 ft 6 ft

10
Ex: Find the circumference & area of the circle. C=2πr C=2π(5in) C=10π in C≈31.4 in A=πr 2 A=π(5in) 2 A=25π in 2 A≈78.5 in 2 1 0 i n

11
More Practice Problems Solve the area of a square that has a perimeter of 24 meters.

12
More Practice Problems If a circle has a circumference of 100 yards, then what is its area?

13
More Practice Problems You are planning a deck along two sides of a pool. The pool measures 18 feet by 12 feet. The deck is to be 8 feet wide. What is the area of the deck?

Similar presentations

Presentation is loading. Please wait....

OK

Geometry.

Geometry.

© 2019 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google