Two identical rectangles are to be cut along the diagonals and the triangles got joined with another rectangle, to make a regular hexagon as shown below:
What should be dimensions of the rectangles?
Given: ABHCDE is a regular hexagon made by using a rectangle and some pieces of rectangles cut along its diagonal.
We know that all the sides and angles of a regular hexagon are equal.
∴ AB = BH = HC = CD = DE = EA = 30 cm
Measure of each angle of a regular hexagon = 120°
⇒ ∠EDC = ∠DCH = ∠CHB = ∠HBA= ∠BAE = ∠AED = 120°
Measure of each angle of a rectangle = 90°
⇒ ∠ADC = ∠EFD = 90°
Now, ∠EDF = ∠EDC − ∠ADC = 120° − 90° = 30°
Using angle sum property in ΔEFD:
∠EFD + ∠FDE + ∠DEF = 180°
⇒ 90° + 30° + ∠DEF = 180°
⇒ 120° + ∠DEF = 180°
⇒ ∠DEF = 180° − 120° = 60°
Thus, the angles of ΔEFD are 30°, 60° and 90°.
Therefore, the ratio of the lengths of the sides of ΔEFD is 1::2.
⇒ DF =
⇒ AF = DF = (As both are the sides of identical rectangles.)
AD = AF + FD =
EF =
Therefore, the dimensions of the larger rectangle are 30 cm and
The dimensions of the smaller rectangle are 15 cm and