Question

Find percentage of area of triangle when each side is doubled

Answer 1

$suppose \: sides \: are \: 10 \: and \: 10 \\ area \: \: 10 \times 10 = 100 \\ \: \: \: \: \: \: \: \: \: \: \: 20 \times 20 = 400 \\ percent \: is \: \: \frac{400 - 100}{100} \times 100 \\ 300\%$