1.5 Using Formulas in Geometry

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Presentation transcript:

1.5 Using Formulas in Geometry

Definitions: Perimeter: is the sum of the side lengths of a plane figure. Area: is the number of nonoverlapping square units of a given size that exactly cover the plane figure

Formulas:

Examples: Find the perimeter and area of each figure.

Example: Find the perimeter and area of a square with a side length of 3.5 inches. The Queens Quilt block includes 12 blue triangles. The base and height of each triangle are about 4 inches. Find the approximate amount of fabric used to make the 12 triangles.

Example: Find the amount of fabric used to make four rectangles. Each rectangle has a length of 6.5 inches and a width of 2.5 inches.

Definitions: Diameter- a segment of a circle that passes through the center of the circle and whose endpoints are on the circle. Radius- a segment of a circle whose endpoints are the center of the circle and a point on the circle. Circumference- The distance around the circle (perimeter)

Formulas:

Examples: Find the circumference and area of a circle with a radius of 8 centimeters. Find the circumference and area of a circle with a radius of 14 meters.