A fly was sitting on the ground in the front left corner of your classroom. He flew to the ceiling in the opposite corner of the
room. How far did he fly if the room is 12 feet by 8 feet by 9 feet?
A- 12.0 feet
B- 17 feet
C- 14.4 feet
D- 864 feet
A- 12.0 feet
B- 17 feet
C- 14.4 feet
D- 864 feet
1 answer:
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P(7,6), Q(1,6), R(4,2)
We have PQ parallel to the x axis. We'll call that the base,
b = 7 - 1 = 6
The altitude is then the y difference h = 6 - 2 = 4
The area is
Answer: 12 square units
In general we can use the shoelace formula for the area of any polygon given coordinates. We write the points like this:
(7,6), (1,6), (4,2)
(1,6), (4,2), (7,6)
The area is then half the absolute value of the sum of the cross products: