we find that h v pi r squared we can then plug h into the area equation so far we ve only used algebra to get our new formula for area picture of formula making r the subject of a formula volume of a cone pi 3 r 2 h image titled calculate the area of a circle step 2 proof of area of circle pi r square image titled find the cirference and area of a circle step 6 image titled calculate the cirference of a circle step 3 image titled calculate the radius of a circle step 3 image titled calculate the radius of a circle step 10 image titled calculate the area of a circle step 13 area of circles ter chart made by rhettallain plotly image titled calculate the radius of a circle step 6 pi r squared using matrix notation the standard regression may be written as image titled calculate pi step 4 image titled calculate the area of a circle step 1 how to calculate the cirference of a circle casio calculator gcse maths fx 83gt plus fx85gt image titled calculate the radius of a circle step 4 surface area of a sphere deriving the formula pier 27 condos 1960 sq ft quick view image titled calculate the area of a circle step 6 pier 27 condos 1921 sq ft quick view image titled calculate the radius of a circle step 15 image titled calculate the area of a circle step 7 pier 27 condos 1921 sq ft quick view computer drawings of several objects the equations for the volume of a sphere cylinder pier 27 condos 2450 sq ft quick view pier 27 condos 1303 sq ft quick view computer drawings of several nose cones the equations for the volume of a cone python program to calculate area of a circle using diameter image titled find the surface area of a sphere step 1 pier 27 condos 1415 sq ft quick view pier 27 tower on the lake condos 481 sq quick view 3 100 sq ft up to 300 guests meyda lighting 116060 18 sq seneca plain mission pier mount pier 27 condos 2364 sq ft quick view pier 27 condos 1920 sq ft quick view