Question

In an equilateral triangle ABC if AD⊥BC, then
A. 5AB² = 4AD²
B. 3AB² = 4AD²
C. 4AB² = 3AD²
D. 2AB² = 3AD²

Answer 1

do same as this:

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Question:-

ΔABC is an isosceles triangle in which ∠C= 90° . If AC = 6 cm, then AB=

A. 6√2 cm

B. 6 cm

C. 2√6 cm

D. 4√2cm

In triangle ABC

Let tge altitude be AD on BC

AC=25cm

AB=25cm

BC=14cm

Therefore DC= 1/2*BC

=1/2*14

=7

By Pythagoras theorem,

AD^2+CD^2=AC^2

AD^2+7^2=25^2

AD^2+49=625

AD^2=625-49

AD^2=576

AD=24

Therefore altitude from A on BC is 24 cm

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Answer 2

Answer:

D) 2AB^2 = 3 AD^2

I hope its help you dear