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D and E are the mid-points of AB and AC ...

D and E are the mid-points of AB and AC of the equilateral `DeltaABC`. If DE + AB = 15 cm, then, DE =

A

4 cm

B

5 cm

C

6 cm

D

8 cm

Text Solution

Verified by Experts

The correct Answer is:
b
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Knowledge Check

  • The mid-points of the sides AB, BC and CA of the equilateral DeltaABC are D, E and F respectively, AE intersects DF at O. If angleOBD=15^@ , then angleAOB=

    A
    `45^@`
    B
    `105^@`
    C
    `120^@`
    D
    `135^@`

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