<?xml version="1.0" encoding="utf-8"?>
<!-- More Geometry Snacks #6 (Curiosity Closet), drawn by hand as a ruler-and-compass construction.
     The rectangle ABKH on the hidden points A and B: the corner K is a handle on a hidden vertical stretch above B,
     which sets the rectangle's height, and H is where the perpendicular at A meets the parallel to AB through K. The
     handle P is a point inside the rectangle. The parallel to AB through P meets the sides at L and Q, with right angles
     there, marked by small squares built with a circle of radius AB/32; the segments AP and PK close the two triangles
     ALP and KPQ that the book hatches (drawn solid red here, the player has no hatching, and the statement says red),
     and HPB is the shaded triangle, drawn last with a fill that is 70% opaque so the red shows through where they
     overlap, as the hatching does in the book. Its area is the difference of the red ones wherever P and K are. -->
<Drawing Version="1">
  <Viewport Left="-0.8" Top="8.3" Right="7.8" Bottom="-0.8" />
  <Scene Left="-0.8" Top="8.3" Right="7.8" Bottom="-0.8" />
  <Styles>
    <PointStyle Name="Handle" Size="15" Fill="#FFFFFFFF" Color="#FF1E1E1E" StrokeWidth="2.5">
      <Dark Fill="#FF1E2228" Color="#FFF2F2F2" />
    </PointStyle>
    <ShapeStyle Name="Blue" Color="#FF0000FF" StrokeWidth="3" Fill="#B3B9B9FF">
      <Dark Color="#FF9DA3FF" Fill="#B37F86D6" />
    </ShapeStyle>
    <ShapeStyle Name="Red" Color="#FF000000" StrokeWidth="3" Fill="#FFEF303F">
      <Dark Color="#FFE8EBF0" Fill="#FFD9333F" />
    </ShapeStyle>
    <ShapeStyle Name="Frame" Color="#FF000000" StrokeWidth="3" IsFilled="false">
      <Dark Color="#FFE8EBF0" />
    </ShapeStyle>
    <LineStyle Name="Ink" Color="#FF000000" StrokeWidth="3">
      <Dark Color="#FFE8EBF0" />
    </LineStyle>
    <ShapeStyle Name="Mark" Color="#FF000000" StrokeWidth="2" IsFilled="false">
      <Dark Color="#FFE8EBF0" />
    </ShapeStyle>
  </Styles>
  <Figures>
    <FreePoint Name="A" Visible="false" Locked="true" X="0" Y="0" />
    <FreePoint Name="B" Visible="false" Locked="true" X="7" Y="0" />
    <FreePoint Name="Z1" Visible="false" Locked="true" X="7" Y="1.5" />
    <FreePoint Name="Z2" Visible="false" Locked="true" X="7" Y="7.5" />
    <Segment Name="AB" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="B" />
    </Segment>
    <Segment Name="Track" Visible="false">
      <Dependency Name="Z1" />
      <Dependency Name="Z2" />
    </Segment>
    <PointOnFigure Name="K" Style="Handle" X="7" Y="5" Parameter="0.5833">
      <Dependency Name="Track" />
    </PointOnFigure>
    <PerpendicularLine Name="a" Visible="false">
      <Dependency Name="AB" />
      <Dependency Name="A" />
    </PerpendicularLine>
    <ParallelLine Name="k" Visible="false">
      <Dependency Name="AB" />
      <Dependency Name="K" />
    </ParallelLine>
    <IntersectionPoint Name="H" Visible="false" Algorithm="IntersectLineAndLine">
      <Dependency Name="a" />
      <Dependency Name="k" />
    </IntersectionPoint>
    <Segment Name="AH" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="H" />
    </Segment>
    <Segment Name="BK" Visible="false">
      <Dependency Name="B" />
      <Dependency Name="K" />
    </Segment>
    <Polygon Name="Rectangle" Style="Frame">
      <Dependency Name="A" />
      <Dependency Name="B" />
      <Dependency Name="K" />
      <Dependency Name="H" />
    </Polygon>
    <PointInRegion Name="P" Style="Handle" X="6" Y="2">
      <Dependency Name="Rectangle" />
    </PointInRegion>
    <ParallelLine Name="p" Visible="false">
      <Dependency Name="AB" />
      <Dependency Name="P" />
    </ParallelLine>
    <IntersectionPoint Name="L" Visible="false" Algorithm="IntersectLineAndLine">
      <Dependency Name="p" />
      <Dependency Name="AH" />
    </IntersectionPoint>
    <IntersectionPoint Name="Q" Visible="false" Algorithm="IntersectLineAndLine">
      <Dependency Name="p" />
      <Dependency Name="BK" />
    </IntersectionPoint>
    <Polygon Name="LowerRed" Style="Red">
      <Dependency Name="A" />
      <Dependency Name="L" />
      <Dependency Name="P" />
    </Polygon>
    <Polygon Name="UpperRed" Style="Red">
      <Dependency Name="K" />
      <Dependency Name="P" />
      <Dependency Name="Q" />
    </Polygon>
    <Segment Name="LQ" Style="Ink">
      <Dependency Name="L" />
      <Dependency Name="Q" />
    </Segment>
    <Polygon Name="Shaded" Style="Blue">
      <Dependency Name="H" />
      <Dependency Name="P" />
      <Dependency Name="B" />
    </Polygon>
    <!-- the right-angle marks at L and Q: squares of side AB/32 (five midpoints), the circle of that radius about
         the corner cut by the lines of the two sides (the lines, not the sides: with P on the top or bottom side the
         corner of the mark would be past the side's end), the fourth corner by a reflection in a midpoint; an
         AngleArc would vanish there, these stay -->
    <MidPoint Name="m16" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="B" />
    </MidPoint>
    <MidPoint Name="m8" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="m16" />
    </MidPoint>
    <MidPoint Name="m4" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="m8" />
    </MidPoint>
    <MidPoint Name="m2" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="m4" />
    </MidPoint>
    <MidPoint Name="m1" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="m2" />
    </MidPoint>
    <CircleByRadius Name="cL" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="m1" />
      <Dependency Name="L" />
    </CircleByRadius>
    <IntersectionPoint Name="L1" Visible="false" Algorithm="IntersectLineAndEllipse2">
      <Dependency Name="p" />
      <Dependency Name="cL" />
    </IntersectionPoint>
    <IntersectionPoint Name="L2" Visible="false" Algorithm="IntersectLineAndEllipse1">
      <Dependency Name="a" />
      <Dependency Name="cL" />
    </IntersectionPoint>
    <MidPoint Name="mL" Visible="false">
      <Dependency Name="L1" />
      <Dependency Name="L2" />
    </MidPoint>
    <ReflectedPoint Name="L3" Visible="false">
      <Dependency Name="L" />
      <Dependency Name="mL" />
    </ReflectedPoint>
    <Polygon Name="RightAngleL" Style="Mark">
      <Dependency Name="L" />
      <Dependency Name="L1" />
      <Dependency Name="L3" />
      <Dependency Name="L2" />
    </Polygon>
    <CircleByRadius Name="cQ" Visible="false">
      <Dependency Name="A" />
      <Dependency Name="m1" />
      <Dependency Name="Q" />
    </CircleByRadius>
    <IntersectionPoint Name="Q1" Visible="false" Algorithm="IntersectLineAndEllipse1">
      <Dependency Name="p" />
      <Dependency Name="cQ" />
    </IntersectionPoint>
    <PerpendicularLine Name="b" Visible="false">
      <Dependency Name="AB" />
      <Dependency Name="B" />
    </PerpendicularLine>
    <IntersectionPoint Name="Q2" Visible="false" Algorithm="IntersectLineAndEllipse2">
      <Dependency Name="b" />
      <Dependency Name="cQ" />
    </IntersectionPoint>
    <MidPoint Name="mQ" Visible="false">
      <Dependency Name="Q1" />
      <Dependency Name="Q2" />
    </MidPoint>
    <ReflectedPoint Name="Q3" Visible="false">
      <Dependency Name="Q" />
      <Dependency Name="mQ" />
    </ReflectedPoint>
    <Polygon Name="RightAngleQ" Style="Mark">
      <Dependency Name="Q" />
      <Dependency Name="Q1" />
      <Dependency Name="Q3" />
      <Dependency Name="Q2" />
    </Polygon>
  </Figures>
</Drawing>
