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In parallelogram ABCD,AB = 6,BC = 8, and
$\angle A = 45^\circ.$ Find the area of the parallelogram.

User Mistertim
by
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1 Answer

4 votes

Answer:


\huge\boxed{A=24\sqrt2}

Explanation:

Look at the pictures.

In the ΔAED the sides are in the proportion
1:1:\sqrt2

Therefore we have the equation:


|AE|\sqrt2=6\qquad\text{multiply both sides by}\ \sqrt2\\\\2|AE|=6\sqrt2\qquad\text{divide both sides by 2}\\\\|AE|=3\sqrt2

Therefore


|ED|=3\sqrt2

The formula of an area of a parallelogram:


A=bh\\\\b-base\\h-height

We have


base=|AB|=8\\height=|ED|=3\sqrt2

Substitute:


A=(8)(3\sqrt2)=24\sqrt2

In parallelogram ABCD,AB = 6,BC = 8, and $\angle A = 45^\circ.$ Find the area of the-example-1
In parallelogram ABCD,AB = 6,BC = 8, and $\angle A = 45^\circ.$ Find the area of the-example-2
User Jaredsk
by
7.7k points