How do we find the radius?
r=d/2
What is the radius of a circle?
The radius is the distancefrom the center to anypoint on the circle.
circle with radius of 3cm
18.84
circle with diameter of 7m
38.46m
How do we find the diameter of a circle?
d=2r
What is the diameter of a circle?
The diameter is thedistance across the circlethrough the center.
circle with diameter of 3ft
9.42 ft
circle with radius of 10cm
314 cm
How do we find the circumference of a circle?
or C = πd
What is the circumference of a circle?
The distance around a circle is called the circumference.
circle with radius of 7.3cm
45.84cm
circle with radius of 11in
379.95in
How do we find the area of a circle?
What is a circle?
A circle is the set of all points in a plane that are the same distance from a point called the center.
circle with diameter of 9.9cm
31.1 cm
circle with diameter of 11cm
94.98cm
How do we find the area of a semicirlce?
A = (π * r^2) / 2
What is a composite figure?
A composite figure is made up of triangles, squares, rectangles, semicircles, and other two-dimensional figures.
circle with diameter of 20.6yd
64.7 yd
circle with radius of 14mm
615.8mm