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 TalkPHP » Math Help -.-..I'm stuck geometry question
 03-28-2008, 03:47 PM #1 (permalink) The Addict   Join Date: Nov 2007 Posts: 282 Thanks: 61 Math Help -.-..I'm stuck geometry question I tried splitting up the image into 3 parts, 2triangles, retangle, and tried doing the Pytagorean Theorem on the triangle, no luck because each triangles base can't be 5 since it isn't a isosceles trapezoid. My teacher had problems with it in the teacher manual said they split it into a parallelogram and a triangle, but I still won't get the height of the triangle because I can't define if its a isosceles triangle. If you figure it out mind explaning. The real question is find the area, I got the area from teacher but she wants to know how to find the height, got me confused -.-... __________________ PHP/XHTML Freelancer: Cleanscript.com v3 - Programming starting at just \$5 act now!
 03-28-2008, 05:15 PM #2 (permalink) The Wanderer       Join Date: Mar 2008 Posts: 18 Thanks: 0 Sorry for my bad English ;) the line that is || the side of length 6 is right. the triangles bottom sides length is 10 (32-22=10) So you get a triangle with sides 6 8 10 these numbers are specific for a triangle with 90*. to get the height u firstly need to get the triangles square. square = 6*8/2. And finally the height = 2*square/a . Where a = 10. If the triangle you got is without the 90* corner then the formula for its square is S=sqrt(p(p-a)(p-b)(p-c)) the formula is called Heron formula. And p = (a+b+c)/2 a,b,c are the sides of the triangle
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 Nor (03-28-2008)
 03-28-2008, 09:59 PM #3 (permalink) The Addict   Join Date: Nov 2007 Posts: 282 Thanks: 61 Thanks, but if the total area of the complete trapizoid is 129.65(something) how is this possible? teacher handbook said thats what total area is. Heres my work: square of triangle(sot) = a*b/2 sot = 6*8/2 sot = 48/2 sot = 24 height = 2*square/a height = 2*24/6 height = 48/6 height = 8 trapizoid area(ta) = (h(b1+b2))/2 ta = 8(22+32) / 2 ta = 8*52 / 2 ta = 416 / 2 ta = 208 units squared __________________ PHP/XHTML Freelancer: Cleanscript.com v3 - Programming starting at just \$5 act now!
 03-28-2008, 10:54 PM #4 (permalink) The Wanderer       Join Date: Mar 2008 Posts: 18 Thanks: 0 square of triangle(sot) = a*b/2 sot = 6*8/2 sot = 48/2 sot = 24 //a is the side of triangle to which the height is pointing // if you imagine a triangle ABC and the height is A to a point on BC then BC is that "a" height = 2*square/a height = 2*24/10 height = 48/10 height = 4.8 trapizoid area(ta) = (h(b1+b2))/2 ta = 4.8(22+32) / 2 ta = 4.8*54 / 2 ta = 259.2 / 2 ta = 129.6 units squared
 The Following User Says Thank You to martins256 For This Useful Post:
 Nor (03-28-2008)
 03-28-2008, 11:05 PM #5 (permalink) The Addict   Join Date: Nov 2007 Posts: 282 Thanks: 61 OHHH DUDE XD NICE, I used 8 instead of 10, and some other bugz :P :\$ wow your a life savor, going to show off to my teacher monday :) __________________ PHP/XHTML Freelancer: Cleanscript.com v3 - Programming starting at just \$5 act now!

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