Look at the following rectangle:
ΔEDC is equilateral.
Calculate the perimeter of the rectangle.
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Look at the following rectangle:
ΔEDC is equilateral.
Calculate the perimeter of the rectangle.
A rectangle has two pairs of equal opposite sides.
That is:
BC=AD=4
AB=DC
In an equilateral triangle, all sides are equal, therefore:
EC=CD=DE
We know that EC=8, so:
EC=CD=DE=8
We know that:
AB=DC
Therefore:
AB=DC=8
Remember that the perimeter of a rectangle is equal to the sum of all its sides, therefore:
AB+BC+DC+AD
We substitute in all its known sides:
8+4+8+4=
24
24
Look at the rectangle ABCD below.
Side AB is 6 cm long and side BC is 4 cm long.
What is the area of the rectangle?
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