My Math Forum Need help finding a few values.

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 September 9th, 2019, 03:30 PM #1 Newbie   Joined: Sep 2019 From: Elkhart, Indiana Posts: 1 Thanks: 0 Need help finding a few values. I need help in finding a few values in the example picture. I have plugged in some generic values, I am looking for the math to solve ?? values. How do I find the green h? How do I find the green r? How do i find the blue h? The shape is technically isosceles trapezoid, it is cone shaped with a cropped top. disk.jpg Last edited by skipjack; September 9th, 2019 at 10:28 PM.
 September 10th, 2019, 01:13 AM #2 Senior Member   Joined: Apr 2014 From: UK Posts: 965 Thanks: 342 Hopefully I got this right.... The blue 'h' can be found using pythagoras a^2 + b^2 = c^2 where c is 13 (the red slope), a can be 'h', and b is 10-2 [=8] The green 'h' is 11/13 of blue 'h' The green 'r' is 2 + 8x2/13

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