MCQ
In Triangle ABC which is right angled at B. Given that AB = 9cm, AC = 15cm and D, E are the mid-points of the sides AB and AC respectively. Find the length of BC?
- A13cm
- B$13.5cm$
- ✓12cm
- D15cm
✓
Answer
Correct option: C.
12cm
(c) 12 cm
Explanation:
Applying pythagoras theorem in $\triangle ABC$
$AC ^2= AB ^2+ BC ^2$
$15^2=9^2+B C^2$
$225=81+ BC ^2$
$225-81= BC ^2$
$B C^2=144$
$BC =12$
Explanation:
Applying pythagoras theorem in $\triangle ABC$
$AC ^2= AB ^2+ BC ^2$
$15^2=9^2+B C^2$
$225=81+ BC ^2$
$225-81= BC ^2$
$B C^2=144$
$BC =12$
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