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[–] talmoridor-x 0 points 2 points (+2|-0) ago 

A = .5(b*h)-(pi*r^2)

A = approx. 21.5

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[–] Sarcastatron_9000 0 points 2 points (+2|-0) ago 

21.5 units squared, using 3.14 for pi instead of calculating it to more spaces.

Difficult though...mmm...

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[–] grandmacaesar 0 points 0 points (+0|-0) ago 

No, but I can solve that easy geometry problem.

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[–] interneth8machine 0 points 0 points (+0|-0) ago  (edited ago)

(.5x10x20)-25xpi

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[–] tippyc 0 points 0 points (+0|-0) ago 

(4 - pi) / 4 * 10^2 = 21.46

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[–] pizza_mine 0 points 0 points (+0|-0) ago 

E=MC2+Mu not or some Kenetic energy or not. Inertia!

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[–] LostandFound 0 points 0 points (+0|-0) ago 

21.46cm2 ?

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[–] WhiteyWhiteman 0 points 0 points (+0|-0) ago 

MOL: 100 - 25*3.14=21.5