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±×¸²°ú °°ÀÌ À­º¯ÀÇ ±æÀÌ°¡ a ( < b ), ¹Øº¯ÀÇ ±æÀÌ°¡ b, ¿·º¯ÀÇ ±æÀÌ°¡ °¢°¢ c, d ÀÎ »ç´Ù¸®²ÃÀÇ ¸éÀû A ¸¦ ±¸ÇÑ´Ù. (a, b ´Â ÆòÇà)

»ç´Ù¸®²ÃÀÇ ¸éÀûÀº A = (a+b)*h/2 ÀÌ´Ù.

±×¸²¿¡¼­,

c^2 = h^2 + x^2 ¡æ x^2 = c^2 - h^2

d^2 = h^2 + y^2

ÀÌ°í, x+y = b-a = t ¶ó Çϸé,

y^2 = t^2 - 2tx + x^2 = t^2 - 2tx + c^2 - h^2

d^2 = h^2 + t^2 - 2tx + c^2 - h^2
     = t^2 - 2tx + c^2

À̸¦ Á¤¸®Çϸé,

x = (1/(2*t))*(t^2+c^2-d^2)
 =  (1/(2*(b-a)))*((b-a)^2+c^2-d^2)

°¡ µÇ°í,

h = (c^2 - ((1/(2*(b-a)))*((b-a)^2+c^2-d^2))^2)^(1/2)

ÀÌ µÈ´Ù.

µû¶ó¼­ A ´Â ´ÙÀ½°ú °°´Ù.

A = (1/2)*(a+b)*(c^2 - ((1/(2*(b-a)))*((b-a)^2+c^2-d^2))^2)^(1/2)

*** Âü°í¹®Çå[References] ***

A = (1/2)*(a+b)*(c^2 - ((1/(2*(b-a)))*((b-a)^2+c^2-d^2))^2)^(1/2)
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º¯¼ö¸í Variable º¯¼ö°ª Value º¯ ¼ö ¼³ ¸í Description of the variable


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