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K = 52 cm
d1 = 10 cm
Maka,
K = 4 x s
52 = 4 x s
s = 52 : 4
s = 13 cm
Panjang sisi tengah yg akan membentuk segitiga siku²,
= 1/2 x d1
= 1/2 x 10
= 5 cm
Gunakan rumus phytagoras untuk mencari setengah dari d2,
Sehingga,
d2 = 2 x 12
d2 = 24 cm
Luas = 1/2 x d1 x d2
Luas = 1/2 x 10 x 24
Luas = 120 cm²
(JAWABAN B)