Mathematics
Construct a quadrilateral ABCD in which AB = 3.2 cm, BC = 2.8 cm, CD = 4 cm, DA = 4.5 cm and BD = 5.3 cm. Also construct a triangle equal in area to this quadrilateral.
Theorems on Area
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Answer
Steps of construction:
Draw AB = 3.2 cm.
With A as centre and radius 4.5 cm, draw an arc.
With B as centre and radius 5.3 cm draw another arc, cutting the previous arc at D.
Join AD.
With D as centre and radius 4 cm, draw an arc.
With B as centre and radius 2.8 cm, draw another arc cutting the previous arc at C.
Join BC and DC, to form quadrilateral ABCD.
Join BD and through C, construct a straight line parallel to DB to meet AB produced at E.
Join DE.
Since △DBC and △DBE have same base DB and are between the same parallels BD and EC, we have;
ar(△DBC) = ar(△DBE)
ar(quad ABCD) = ar(△ABD) + ar(△DBC)
ar(quad ABCD) = ar(△ABD) + ar(△DBE)
ar(quad ABCD) = ar(△AED)
Hence, triangle AED is the required triangle whose area is equal to the area of the quadrilateral ABCD.
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