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Geometry Level 2

Which one of these methods is not the formula to find the area of a square?

A = s 2 A=s^2 where s s is a side length. A = 2 R 2 A=2R^2 where R R is the circumradius. A = d 3 4 A=\frac {d^3}{4} where d d is the diagonal A = 4 r 2 A=4r^2 where r r is the inradius.

Sharky Kesa by Sharky Kesa , 19, United Kingdom

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4 solutions

Ak Sharma
Feb 26, 2014

side^3 doesn't make sense in case of area so d^3 is answer as d= a x root2

1 Helpful 0 Interesting 0 Brilliant 0 Confused

well in that case, the third option was A=2R,that is just side(it is also not square).Then how is this correct.

Deep Chowdhury - 7 years, 3 months ago

ghanta

Tootie Frootie - 7 years, 3 months ago
Harman Deep
Feb 26, 2014

watch out for units!!! area is for sq. units............. not cubic

1 Helpful 0 Interesting 0 Brilliant 0 Confused

no way

0 Helpful 0 Interesting 0 Brilliant 0 Confused

except 2nd choices every choices have square terms... so they gives square units... but 2nd one have cube term... so it must give cubic units.... hence it becomes volume but not a area....

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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