"What is the area? You should be able to solve this"
08-06-2018, 09:12 PM (This post was last modified: 08-06-2018 09:14 PM by Albert Chan.)
Post: #2
 Albert Chan Senior Member Posts: 1,676 Joined: Jul 2018
RE: "What is the area? You should be able to solve this"
Code:
 solve with coordinate geometry triangle area formula: Spoiler Alert ... let points A = (0,2), B = (2,0), C = (4,2), D = (2,4), P=(x,y) triangle area = (ax(by - cy) + bx(cy - ay) + cx(ay - by)) / 2,  points counter-clockwise  right bottom = 2 + area(A,B,P) = x + y left bottom = 2 + area(B,C,P) = 4 - x + y right top = 2 + area(A,P,D) = 4 + x - y right top = 4*4 - (4 + x - y) - (x + y) - (4 - x - y) = 8 - x - y = 8 - right bottom right top + left bottom = 8 = 16 cm^2 + 32 cm^2 = 48 cm^2 sx area = 8 - right bottom = 48 cm^2 - 20 cm^2 = 28 cm^2
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 Messages In This Thread "What is the area? You should be able to solve this" - Gerson W. Barbosa - 08-06-2018, 06:53 PM RE: "What is the area? You should be able to solve this" - Albert Chan - 08-06-2018 09:12 PM RE: "What is the area? You should be able to solve this" - Albert Chan - 08-07-2018, 02:41 AM RE: "What is the area? You should be able to solve this" - Jim Horn - 08-06-2018, 09:14 PM RE: "What is the area? You should be able to solve this" - ijabbott - 08-06-2018, 09:16 PM RE: "What is the area? You should be able to solve this" - Albert Chan - 08-06-2018, 10:08 PM RE: "What is the area? You should be able to solve this" - Albert Chan - 08-06-2018, 10:52 PM RE: "What is the area? You should be able to solve this" - Robert VM - 08-07-2018, 07:16 PM RE: "What is the area? You should be able to solve this" - Gerson W. Barbosa - 08-07-2018, 12:12 AM RE: "What is the area? You should be able to solve this" - Thomas Klemm - 08-07-2018, 12:41 AM RE: "What is the area? You should be able to solve this" - Albert Chan - 08-07-2018, 12:57 AM RE: "What is the area? You should be able to solve this" - Gerson W. Barbosa - 08-07-2018, 01:53 AM RE: "What is the area? You should be able to solve this" - Gerson W. Barbosa - 08-07-2018, 01:11 AM RE: "What is the area? You should be able to solve this" - Diego Diaz - 08-07-2018, 02:10 AM RE: "What is the area? You should be able to solve this" - Pekis - 08-07-2018, 08:59 AM RE: "What is the area? You should be able to solve this" - Albert Chan - 08-07-2018, 02:20 PM RE: "What is the area? You should be able to solve this" - Robert VM - 08-07-2018, 07:24 PM RE: "What is the area? You should be able to solve this" - tpugsley - 08-08-2018, 01:11 PM RE: "What is the area? You should be able to solve this" - Albert Chan - 08-08-2018, 01:51 PM RE: "What is the area? You should be able to solve this" - Voldemar - 08-08-2018, 04:44 PM RE: "What is the area? You should be able to solve this" - roadrunner - 08-08-2018, 05:03 PM

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