Question

If an angle of a triangle remains unchanged but each of its two including sides is doubled, then the area is multiplied by:

• A. $2$
• B. $3$
• C. $4$
• D. $6$
• E. more than $6$

Answer 1

Answer: (C)

$4$

If the two triangle are similar then then their areas is =A(new)/A(old)=$(2s{)}^2$/$s^2$=$4$

so correct choice is $C$.