tolonglah bantuannya!!!!

a. RS=[tex] \sqrt{ {15}^{2} - {9}^{2} } = \sqrt{225 -81 } = \sqrt{144} = 12cm[/tex]

b. QS=[tex] \sqrt{ {13}^{2} - {12}^{2} } = \sqrt{169 - 144} = \sqrt{25} = 5cm[/tex]

c. L=[tex] \frac{1}{2} at \\ \frac{1}{2} \times 14 \times 12 \\ 84 {cm}^{2} [/tex]