Question

pls experts answer it​

Answer 1

1. Proof:

In ∆CDB, EF||BD

CF/CD=CE/BC (BPT).....(1)

In ∆CAB, DE||AB

DC/AC=CE/BC......(2)..(Similarly)

From (1) and (2);

CF/CD=DC/AC

OR DC²=CF×AC (a)

Answer:

$1. \: (a) \: CF \:\times AC$

$2. \: (d) \: 3cm$

$3. \: (d) \:$

$4. \: (b) \: \frac{3}{2}$

$5. \: (b) \: 0$

$6. \: (b) \: 15$

$7. \: (a) \: 100° \:$

$8. \: (b) \: \frac{1}{25}$

$9. \: (b) \: 462m ^{3}$

$10. \: (b) \: 6cm$