Determine the perimeter of a complex shape Perimeter- the distance around a shape Obj. #45 Some common formulas for perimeter: Square- P=4s or P=s+s+s+s.

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Presentation transcript:

Determine the perimeter of a complex shape Perimeter- the distance around a shape Obj. #45 Some common formulas for perimeter: Square- P=4s or P=s+s+s+s Rectangle-P=2(l + w) 3cm 4x3=12cm ~or~ = 12cm 2cm 6cm 2(2 +6)=16cm ~or~ =16cm 2cm 2.5cm =7cm

Objective #45 (continued) *The center shape is a square. **The triangles are congruent. 3cm 3.5cm I need to be sure to add all sides =20cm

Determine the area of a complex shape Area- The amount of space an object takes up Obj. #46 Some common formulas for area: Square- A=s 2 A=s x s Rectangle-A=l x w Triangle-A=(bxh)/2 3cm 3 2 =9cm 2 ~or~ 3x3=9cm 2 2cm 6cm 3cm 6x2=12cm 2 4cm 3x4=12/2=6cm 2

Objective #46 (continued) *The center shape is a square. **The triangles are congruent. 3cm I need to be sure to add the areas of all shapes 2cm Square- 3 2 =9cm 2 Triangle 1- (3x2)=6 6/2=3cm 2 Triangle 2- (3x2)=6 6/2=3cm 2 Area of complex shape =15cm 2

WP: Determine the area or perimeter of a complex shape Some ways to know if you need to find area or perimeter:  Anything that is fenced in or enclosed is perimeter  If you’re carpeting, cementing, painting, etc. you need to find area Obj. #47