indirakusuma
1. luas ABCD = 14 x (7+24+7) = 14 x 38 = 532 cm² 2. Luas kolam = 532 - (4 luas Δ) = 532 - (4 x 1/2 x 7 x 7) = 532 - 98 = 434 cm² 3. Luas yang diarsir = 4 x Luas Δ = 4 x 1/2 x 7 x 7 = 98 cm² 4. Keliling ABCD = 2 (14+38) = 2x52 = 104 cm 5. sisi miring = √7²+7² = 7√2 K = (2x24) + (4x7√2) = (48 + 28√2) cm
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alahmadharis
1. luas ABCD = p x l = 14 X 38 = 532 cm
2. Luas kolam = 532 - (4 luas Δ) = 532 - (4 x 1/2 x 7 x 7) = 532 - 98 = 434 cm²
3. Luas yang diarsir = 4 x Luas Δ = 4 x 1/2 x 7 x 7 = 98 cm²
4. Keliling ABCD = 2 (14+38) = 2x52 = 104 cm
5. sisi miring = √7²+7² = 7√2
K = (2x24) + (4x7√2) = (48 + 28√2) cm
= 14 X 38
= 532 cm