Dari kemarin kurang paham masalah beginian. mohon bantuannya pakai cara ya kak

cari luas PQS
[tex]l = \frac{1}{2} \times 8 \times (3 + 2 + 3) \\ l = 4 \times 8 = 32 \: {cm}^{2} [/tex]
cari luas PQR
[tex]l \: = \frac{1}{2} \times 8 \times (3 + 2) \\ l = 4 \times 5 = 20 \: {cm}^{2} [/tex]
cari luas PTQ
[tex]l \: = \frac{1}{2} \times 8 \times 3 \\ l = 4 \times 3 = 12 \: {cm}^{2} [/tex]
luas arsir = PQS + PQR - 2(PTQ)
luas arsir = 32 + 20 - 2(12)
luas arsir = 52 - 24 = 28 cm²