Question

plz solve que no 8,9 its very imp for me

Answer 1

,
$heya \\ \\ \\ let \: the \: length \: \: of \: altitude \: be \: l \\ \\ l = 2(area \: of \: trangle) \div base \\ \\ l = 2(25 \times 10 {}^{4} ) \div 20 \\ \\ l = 5 \times 10 {}^{4} \div 2m$