Lesson 1-7: Perimeter,Circumference & Area Warmup A has coordinates (3, 8). B has coordinates (0, –4). C has coordinates (–5, –6). 1. Find the distance.

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Presentation transcript:

Lesson 1-7: Perimeter,Circumference & Area Warmup A has coordinates (3, 8). B has coordinates (0, –4). C has coordinates (–5, –6). 1. Find the distance between A and B to the nearest tenth. 2. Find BC to the nearest tenth. 3. Find the midpoint M of to the nearest tenth. 4. B is the midpoint of. Find the coordinates of endpoint D (-1, 1) (-3, -16)

Perimeter The distance around an object The distance around an object Add all the sides Add all the sides Formulas Formulas Rectangle: P = 2l + 2w (2 lengths and 2 widths) Rectangle: P = 2l + 2w (2 lengths and 2 widths) Square: P = 4s (4 sides – all the same!) Square: P = 4s (4 sides – all the same!) Length Width Side

Circumference Is really the perimeter of a circle Is really the perimeter of a circle Circle parts: Circle parts: Need to use formula: C = pi ● diameter Need to use formula: C = pi ● diameter Optional formula: C = pi ● 2 ● radius Optional formula: C = pi ● 2 ● radius Center Radius Diameter We will use 3.14 for pi

Find the perimeter or circumference. 1)2)3) 5 12 P = 34 7 P = 28 3 C = 18.84

Area Rectangles & Squares Rectangles & Squares Circles Circles Area rectangle = Length ● Width or = Base Height Area square = side ● side or side 2

Find the area. 1)2)3) 5 12 A = 60 7 A = 49 3 A = 28.26

Area of Irregular Shapes Chop up irregular shapes into rectangles Chop up irregular shapes into rectangles A whole = Sum of area of parts A whole = Sum of area of parts