tolong bantu saya please mohon pake cara

L arsir=L trapesium+[tex] \frac{1}{2} [/tex]Llingkaran
          =((a+b)×t/2)+[tex] \frac{1}{2} [/tex](πr²)
          =((14cm+26cm)×16cm/2)+[tex] \frac{1}{2} [/tex](3,14(([tex] \frac{1}{2}(\sqrt{(16cm)^{2}+(26cm-14cm)^{2}})[/tex]))²)
          =(40cm×8cm)+[tex] \frac{1}{2} [/tex](3,14(([tex] \frac{1}{2}(\sqrt{(16cm)^{2}+(12cm)^{2}})[/tex]))²)
          =320cm²+[tex] \frac{1}{2} [/tex](3,14(([tex] \frac{1}{2}(\sqrt{256cm^{2}+144cm^{2}})[/tex]))²)
          =320cm²+[tex] \frac{1}{2} [/tex](3,14(([tex] \frac{1}{2}(\sqrt{400cm^{2}})[/tex]))²)
          =320cm²+[tex] \frac{1}{2}[/tex](3,14(([tex] \frac{1}{2}[/tex](20cm))²)
          =320cm²+[tex] \frac{1}{2}[/tex](3,14(10cm)²)
          =320cm²+[tex] \frac{1}{2}[/tex](3,14(100cm²))
          =320cm²+[tex] \frac{1}{2}[/tex](314cm²)
          =320cm²+157cm²
          =477cm²