Mathematics

Problem

In parallelogram

ABCD

, points

E

and

F

are the midpoints of

BC

and

CD

respectively. If the length of diagonal

BD

10\,\text{cm}

, what is the length of

EF

? a)

7.5\,\text{cm}

5\,\text{cm}

10\,\text{cm}

2.5\,\text{cm}