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Perimeter Rectangles, Squares, and Triangles
Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure, ADD the lengths of its sides.
What is a rectangle? A rectangle has: 4 sides 4 square corners or right angles Opposite sides are of equal lengths Opposite sides are directly across from each other
To find the perimeter of a rectangle: 18 15 Use the formula P= 2 x length + 2 x width P= 2 x 18 + 2 x 15 P= 36 + 30= 66 Or ……. You can always add the sides. P= 18 + 18 +15 +15= 66
What is a square? A square has: 4 equal sides 4 right angles
To find the perimeter of a square: Use the formula: P = 4 x side P = 4 x 3 = 12 3 3 Or.... You can add the sides. P = 3 + 3 + 3 + 3 = 12
What is a triangle? A triangle has 3 sides. All triangles may not look the same, but they all have 3 sides.
To find the perimeter of a triangle: Use the formula: P = side + side + side P = 6 + 6 + 4 = 16 66 4
Circumference of a Circle The perimeter, or the distance around a circle, is called the circumference.
Circumference of a Circle To find the circumference of a circle, you need to know either the diameter or radius of the circle.
The diameter of a circle is a line segment drawn through the center of the circle with endpoints on the circle. Diameter
The radius is a line segment connecting the circle’s center to a point on the circle. The length of the radius is one- half the length of the diameter. Radius Diameter
The formula for finding circumference (C) is C = pi x diameter. The value of pi is about 3.14, so the formula for finding the circumference of a circle is C = 3.14 x diameter.
Find the circumference of the circle. C = pi x diameter C = 3.14 x 4= 12.56 4
Working with Shapes in Two Dimensions
Using Formulas in Geometry
Perimeter and Area Please view this tutorial and answer the follow-up questions on loose leaf to turn in to your teacher.
Definition: A circle is the set of all points on a plane that is a fixed distance from the center.
Perimeter & Area Section 6.1.
Circles: Area and Circumference. Definitions Circumference: Distance around the outside of a circle Area: How many squares it takes to cover a circle.
The outside of the circle is called circumference The circumference is the distance around the circle.
3.4 Area and Circumference 1 Circle A circle is a plane figure that consists of all points that lie the same distance from a fixed point. The fixed point.
The distance around the outside of a shape.
investigate the relationship between the diameter and circumference of a circle.
Target Apply formulas for perimeter, area, and circumference.
$100 Area of Parallelograms Area of Triangles Perimeter And Area Area of Trapezoids Area of Compound Figures & Area and Circumference of Circles $200.
Section 9-4 Perimeter, Area, and Circumference.
Area (geometry) the amount of space within a closed shape; the number of square units needed to cover a figure.
Facts about Area of Shapes Dr. Kent Bryant 5/2011.
Jeopardy Geometry Circles 1 Triangles 2 Polygons 3 Formulas 4 Angles 5 Pot Luck
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Circumference and Area: Circles
Objective Apply formulas for perimeter, area, and circumference.
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