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15. Find area and length using isosceles triangle

$ΔABC$ is an isosceles with

$AB = AC =$ 11

$cm$ and

$BC =$ 18

$cm$ . The height

$AD$ from

$A$ to

$BC$ is 10

$cm$ . Find the area of

$ΔABC$ and the height from

$C$ to

$AB$ , i.e.,

$CE$ .

The area of

$ΔABC$ is

$cm²$ .

The height of the

$CE$ is

$cm$ .

$1$

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