Exemplar exercise problems III — task. Mathematics CBSE, Class 10.

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1. If

$\Delta ABC \sim \Delta EDF$ and

$\Delta ABC$ is not similar to

$\Delta DEF$ , then which of the following is not true?

$AB \cdot EF = AC \cdot DE$
$BC \cdot DE = AB \cdot EF$
$BC \cdot DE = AB \cdot FD$
$BC \cdot EF = AC \cdot FD$

2. If in two triangles

$DEF$ and

$PQR$ ,

$\angle D = \angle Q$ and

$\angle R = \angle E$ , then which of the following is not true?

$\frac{EF}{RP} = \frac{DE}{QR}$
$\frac{DE}{PQ} = \frac{EF}{RP}$
$\frac{EF}{PR} = \frac{DF}{PQ}$
$\frac{DE}{QR} = \frac{DF}{PQ}$

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