Tolong ya!!! ... Pakai jalannya juga!! ......

L. diarsir = L. Juring OAB + L. Segitiga OAB

[tex] = \frac{90}{360} \times l \: lingkaran + \frac{1}{2} \times alas \times tinggi \\ = \frac{1}{4} \times \frac{22}{7} \times {(28cm)}^{2} + \frac{1}{2} \times 28cm \times 28cm \\ = 616 {cm}^{2} + 392 {cm}^{2} \\ = 1008 {cm}^{2} [/tex]