1.5: Using Formulas in Geometry

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Presentation transcript:

1.5: Using Formulas in Geometry

The _________ of a plane figure is the sum of the side lengths of the figure. The _______ of a plane figure is the number of non-overlapping square units of a given size that exactly cover the figure.

The base b can be any side of a triangle The base b can be any side of a triangle. The height h is a segment from a vertex that forms a right angle with a line containing the base. The height may be a side of the triangle or in the interior or the exterior of the triangle.

Find the perimeter and area of each figure.

Find the perimeter and area of a square with s = 3.5 in. Find the amount of fabric used to make four rectangles. Each rectangle has a length of in. and a width of in. The Queens Quilt block includes 12 blue triangles. The base and height of each triangle are about 4 in. Find the approximate amount of fabric used to make the 12 triangles.

In a circle a is a segment that passes through the center of the circle and whose endpoints are on a circle. A of a circle is a segment whose endpoints are the center of the circle and a point on the circle. The of a circle is the distance around the circle.

The ratio of a circle’s circumference to its diameter is the same for all circles. This ratio is represented by the Greek letter  (pi). The value of  is irrational. Pi is often approximated as 3.14 or .

Find the circumference and area of a circle with radius 8 cm Find the circumference and area of a circle with radius 8 cm. Use the  key on your calculator. Then round the answer to the nearest tenth. Find the circumference and area of a circle with radius 14m.