Mathematics

Problem

\triangle LMN

, point

J

is the midpoint of

LM

. A line through

J

parallel to

MN

meets

LN

K

. If

JK = 4.3\,\text{cm}

, calculate

MN

. a)

6.45\,\text{cm}

12.9\,\text{cm}

8.6\,\text{cm}

4.3\,\text{cm}