Question

Срочно!!!
На скреншоте

Answer 1

$s = \frac{1}{2} ab$

a=12дм

$b = \sqrt{ {13}^{2} - {12}^{2} } = \sqrt{25} = 5$

$s = \frac{1}{2} 5 \times 12 = 30 {dm}^{2}$