Beth enlarged the triangle below by a scale of 5. A triangle with a base of 4 centimeters and height of 3.5 centimeters. She found the area of the enlarged triangle. Her work is shown below.

1/2(4)(3.5)(5)= 35 cm2

What was Beth’s error?

we know that

The dilation is a non-rigid transformation that produce similar figures

If two figures are similar, then the ratio of its areas is equal to the scale factor squared

Let

z ----> the scale factor

x ----> the area of the enlarged triangle

y ----> the area of the original triangle

$z^{2}=\frac{x}{y}\\x=y(z^2)$

The area of the enlarged triangle is equal to the area of the original triangle multiplied by the scale factor squared

$x=\frac{1}{2}(4)(3.5)(5^2)=175\ cm^2$

therefore

Ben's mistake was that he multiplied the area of the original triangle by the scale factor

8 0

3 years ago

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This means that if length a = 0.5, then length b = 0.809. In this case, what is length c?

AveGali [126]

Use the equation a^2 + b^2 = c^2.
You will be able to find the length of c by using this equation.

8 0

4 years ago

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