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Circles Calculator

This calculator focuses on the calculation of area, circumference, radius and diameter of a circle.

 

Circle

A = Area.

C = Circumference

R = Radius

D = Diameter

Example:

1 Calculate the area of a 10" circle.

key in 10, press A(D)

The answer is 78.54.

2. Calculate the Diameter of 78.54 sq. in. circle.

press "shift", D(A).

The answer is 10.

 

For more information:

Wikipedia Circle

Using the "long press" gesture will display a hint about any key. (Video: Displaying a hint) You can inspect the Key Details to see the formulas and functions for any key.

 

Top rows

 

Label Description
A(R) Calculates the area of a circle given the radius.
A(D) Calculates the area of a circle given the diameter.
A(C) Calculates the area of a circle given the circumference.
C(R) Calculates the circumference of a circle given the radius.
C(D) Calculates the circumference of a circle given the diameter.
Calculates the square root of x.
Calculates x squared.
1/x Calculates the reciprocal of x.
SWAP Swaps the x and y registers.
÷ Divides y by x.
ROLL Rolls the stack down.
× Multiplies y times x.
Subtracts x from y.
% Calculates the x percent of y.
+ Adds y to x.

 

With shift

 

Label Description
R(A) Calculates the radius of a circle given the area.
D(A) Calculates the diameter of a circle given the area.
C(A) Calculates the circumference of a circle given the area.
R(C) Calculates the radius of a circle given the circumference.
D(C) Calculates the diameter of a circle given the circumference.
ln Calculates the natural logarithm of x.
exp Calculates the base-e exponential of x.
y^x Calculates y raised to power of x.
%T Calculates what percentage x is of y.
last x Recalls the 'last x' value.
clr m Clears all of the user memory.
clr s Clears the stack registers (x, y, z, t).
π Enters pi into x.
sin Calculates the sine of x for the current degree/radian mode.
cos Calculates the cosine of x for the current degree/radian mode.
tan Calculates the tangent of x for the current degree/radian mode.
rand Calculates a random number greater than or equal to 0 and less than 1.
asin Calculates the arc sine of x for the current degree/radian mode.
acos Calculates the arc cosine of x for the current degree/radian mode.
atan Calculates the arc tangent of x for the current degree/radian mode.
x! Calculates the factorial of x.
DEC x Sets the number of decimal places to the value in x.
INTG Calculates the integer part of x.
FRAC Calculates the fractional part of x.
RND Rounds x to the number of digits displayed.
nPr Calculates the number of ordered ways that x objects can be chosen from a set of y objects.
d/r Switches between the degree and radian mode.
⇒deg Converts x from radians to degrees.
⇒rad Converts x from degrees to radians.
Δ% Calculates the percent change from y to x.
nCr Calculates the number of ways that x objects can be chosen from a set of y objects.

 

With STO