Download presentation

Presentation is loading. Please wait.

1
**Formulas for Geometry Mr. Ryan**

Visit for more free powerpoints

2
**Free powerpoint template: www.brainybetty.com**

Don’t Get Scared!!! Evil mathematicians have created formulas to save you time. But, they always change the letters of the formulas to scare you! Free powerpoint template:

3
**Free powerpoint template: www.brainybetty.com**

Perimeter Any shape’s “perimeter” is the outside of the shape…like a fence around a yard. Free powerpoint template:

4
**Free powerpoint template: www.brainybetty.com**

Perimeter To calculate the perimeter of any shape, just add up “each” line segment of the “fence”. Free powerpoint template:

5
**Free powerpoint template: www.brainybetty.com**

Perimeter Triangles have 3 sides…add up each sides length. 8 8 8+8+8=24 The Perimeter is 24 8 Free powerpoint template:

6
**Free powerpoint template: www.brainybetty.com**

Perimeter A square has 4 sides of a fence 12 12 12 =48 12 Free powerpoint template:

7
**Free powerpoint template: www.brainybetty.com**

Perimeter Sometimes, problems may only give you two measurements for a square or rectangle. No problem…use the formula for squares/rectangles (only!) Free powerpoint template:

8
**Free powerpoint template: www.brainybetty.com**

Remember Squares ALL sides are equal…so if they give you one side, you know ALL the sides Length=the Largest side If they “leave” numbers out, they are equal to their opposite side. If they give you the bottom of a square/rectangle type shape then the top is the same Free powerpoint template:

9
**Free powerpoint template: www.brainybetty.com**

The Same!! If the bottom is 15…the top is… 15 Free powerpoint template:

10
**Square/Rectangle Formula**

Perimeter=2(Length+Width) P= 2(25+14) P=2(20+20) P= P=40+40 P= P=80 14 20 25 Free powerpoint template:

11
**Free powerpoint template: www.brainybetty.com**

Other shapes Just add up EACH segment 10 8 sides, each side 10 so =80 Free powerpoint template:

12
**Free powerpoint template: www.brainybetty.com**

Odd shapes Count ALL sides Remember if one side blank, it’s equal to its opposite =40 (for Width) 25+25=50 (for Length) 5 15 Perimeter=90 25 Free powerpoint template:

13
**Free powerpoint template: www.brainybetty.com**

Area Area is the ENTIRE INSIDE of a shape It is always measured in “squares” (sq. inch, sq ft) Free powerpoint template:

14
**Free powerpoint template: www.brainybetty.com**

AREA Square units means that “that” many squares fit inside that shape (if measured in feet…it’s feet…if meters…it’s meters. In this example the area is 4 square units…note 4 squares fit) 1 2 3 4 2 units (ft, in, m) Free powerpoint template:

15
**Area of Squares/Rectangles**

Length x Width=Area 2 Length(2) xWidth(2) = 4 square units Free powerpoint template:

16
**Free powerpoint template: www.brainybetty.com**

Parallelogram Area Same idea as squares & rectangles, but they change the words to Base (length:bottom of shape) and height (width) Free powerpoint template:

17
**Free powerpoint template: www.brainybetty.com**

Parallelogram Area Area=Base x Height (Area=length x width) The diagonal line is NOT the height!!! 5 Height (width) 8 BASE (length) Base 8 x Height 5 = Area 40 Free powerpoint template:

18
**REAL formula for area of squares**

Area= S^2 Area= Side x Side (side squared) (just a different way of saying length x width) Side one Side two Free powerpoint template:

19
**Different Names/Same idea**

Length x Width = Area Side x Side = Area Base x Height = Area Free powerpoint template:

20
**Free powerpoint template: www.brainybetty.com**

Area of a Triangle ½ Base x Height = Area (It’s ½ because ½ of the “square” is missing) Height 5 Base 8 Height ½ Base x Height = Area ½ (8) x = Area x = 20 Base Free powerpoint template:

21
**Free powerpoint template: www.brainybetty.com**

Area of a Circle Pi= 3.14 Radius: from center (origin) of circle to ANY side Area= pi x (Radius x Radius) Free powerpoint template:

22
**Circumference of a Circle**

Perimeter/Circumference = pi x diameter Pi is always 3.14 Circumference is a fancy name for perimeter The diameter is a line from one side to the other side of a circle through its origin (It’s twice the radius) If the radius is 5, then the diameter is 10 Free powerpoint template:

23
**Free powerpoint template: www.brainybetty.com**

Area of a circle Area = piR^2 Pi = and R=Radius 5 Radius Area=3.14 x (5 x 5) Perimeter = 3.14 x 10 Free powerpoint template:

24
**Free powerpoint template: www.brainybetty.com**

You’re Done Squares, rectangles and parallelograms area are almost the same (LxW) Triangles are ½ cause your missing ½ Circles have fancy names, but just follow the formula Free powerpoint template:

25
**Free powerpoint template: www.brainybetty.com**

For most tests you will have the formulas given to you. Just remember which one to use for which shape and you’ll do fine. Free powerpoint template:

Similar presentations

OK

Jeopardy Q 1 Q 6 Q 11 Q 16 Q 21 Q 2 Q 7 Q 12 Q 17 Q 22 Q 3 Q 8 Q 13

Jeopardy Q 1 Q 6 Q 11 Q 16 Q 21 Q 2 Q 7 Q 12 Q 17 Q 22 Q 3 Q 8 Q 13

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on atmospheric refraction for class 10 Ppt on thermal power plant operation Ppt on brand strategy Ppt on projectile motion Ppt on teachers day celebration Ppt on history of science and technology Ppt on health care system in india Download ppt on turbo generator maintenance Ppt on census and sample methods of collection of data Ppt on models of marketing communication