find the distance between the points below (9, 0) and (5,2) find the length of the hypotenuse if...
DESCRIPTION
First we must define some things about a circle. The radius is the distance from the center of a circle to any point on a circle.TRANSCRIPT
Find the distance between the points below(9, 0) and (5,2)
Find the length of the hypotenuse if the length of the legs are 4 and 2
The circumference of a circle is
The distance around a circle
First we must define some things about a circle.
The radius is the distance from the center of a circle to any point on a
circle.
The diameter is the distance across a circle through the
center.
We use Pi as the measurement to help us find the circumference of a circle.
Pi, not Pie!
Two formulas are used in finding the circumference of a
circle.
Circumference = d
WHEN THE CIRCLE HAS A DIAMETER MEASUREMENT, USE THE FOLLOWING FORMULA.
4in.
Circumference = 2 r
When the radius of a circle is given, the following formula
should be used.
5 in
Tell me what formula would be used to solve the next five problems.
3in
C =
8ft
C =
122mm
C =
17.5 cm
C =
Find the perimeter of this shape
Use π = 3.14 to find perimeter of this shape.
The perimeter of this shape is made up of the circumference of a circle of diameter 13 cm and two lines of length 6 cm.
6 cm13 cm
Formula for the area of a circle
We can find the area of a circle using the formula
radius
Area of a circle = πr2
Area of a circle = π × r × r
or
The circumference of a circle
Use π = 3.14 to find the area of this circle.
A = πr24 cm
Finding the area given the diameter
The radius of a circle is half of its radius, or
We can substitute this into the formula
A = πr2
r = d2
The area of a circle
Use π = 3.14 to find the area of the following circles:
A = πr22 cm A = πr210 m
A = πr2
23 mm
A = πr278 cm
Find the area of this shape
Use π = 3.14 to find area of this shape.
The area of this shape is made up of the area of a circle of diameter 13 cm and the area of a rectangle of width 6 cm and length 13 cm.
6 cm13 cm
Holt McDougal Geometry
10-3Composite Figures
A composite figure is made up of simpleshapes, such as triangles, rectangles,trapezoids, and circles.
To find the area of a composite figure, find the areas of the simple shapes and then use the Area Addition Postulate.
Holt McDougal Geometry
10-3Composite Figures
Find the shaded area. Round to the nearest tenth, if necessary.
Example 1A: Finding the Areas of Composite Figures by Adding
Holt McDougal Geometry
10-3Composite FiguresCheck It Out! Example 1
Find the shaded area. Round to the nearest tenth, if necessary.
Holt McDougal Geometry
10-3Composite FiguresExample 2: Finding the Areas of Composite Figures by
SubtractingFind the shaded area. Round to the nearest tenth, if necessary.
Holt McDougal Geometry
10-3Composite FiguresCheck It Out! Example 2
Find the shaded area. Round to the nearest tenth, if necessary.