Question

A triangle LMN has been reduced by scale factor 0.8 to the triangle L' M' N'. Then the length of M'N', if MN = 8cm is

• A. 6 cm
• B. 6.4 cm
• C. 7.2 cm
• D. 7.6 cm

Answer 1

The correct option is B

6.4 cm

$△LMN$ has been reduced by the scale factor $0.8=\frac{4}{5}$ to $△L^{\prime }{M}^{\prime }{N}^{\prime }$
Length of $M^{\prime }{N}^{\prime }$ if MN = 8 cm
$M^{\prime }{N}^{\prime }=8\times \frac{4}{5}=\frac{32}{5}cm=6.4cm$