It is because your 1 inch is one circle 1 inch one circle one of each get it.
A 6 inch circle is the measurement from one edge through the centre to the opposite edge. This line is known as the circle's diameter.
A circle with a 12 inch diameter has a 6 inch radius.
The circumference of a six-inch diameter circle is: 18.8 inches.
The circumference of 9 inch diameter circle is about 28.27 inches.
The circumference of a circle with a 20.5 inch diameter is 64.4 inches.
The circumference of a circle with a 39 inch diameter is 122.52 inches.
The Diameter of a Circle is twice the Radius.thus for a 52 inch Diameter Circle the Radius will be 52/2=26 inches.
one inch is one inch; one inch dia refers to one inch diameter of a circle; it is still one inch
The circumference of a 10-inch diameter circle is: 31.4 inches.
The area of 3.5-inch diameter circle is: 9.621 square inches.
The area of a 18-inch diameter circle is: 254.5 square inches.