2 years ago

In the figure, M and N are midpoints of RT and ST. What is the length of MN?

1 answer:

3 0

Length RS = 2b - 2a

Given that N is the midpoint of TS
⇒ Ratio of TN : TS = 1 : 2

$\dfrac{TN}{TS} = \dfrac{MN}{RS}$

$\dfrac{1}{2} = \dfrac{MN}{2b-2a}$

$2MN = 2b - 2a$

$MN = b - a$

Answer: b - a

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