Hello, Eenhoorn!

Rectangle with triangle

where is between and , and is between and

Show that the area of is given by: .Code:. . . 10 . . P *---------------* Q . . . |* *:::::::::::| . . . |:* *::[3]::| 12-x . . . |::* *:::| . .12 |:::* * T . . . |::::* *:| . . . |:[1]:* *:::| x . . . |::::::* *:[2]:| . . S *-------*-------* R . . . x V 10-x

Area of

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