Jika AE = FB = 4 cm maka luas daerah trapesium ABCD adalah
nurhoisam
Diket : AE = FB = 4cm AC = 15cm ED = FC = 9cm Dit : L.Trap.ABCD = ...? Jwb : cari panjang AF dg pitagoras. AF² = AC² - FC² = 225 - 81 = 144 AF = √144 = 12 cm.
Panjang DC = AF - AE = 12 - 4 = 8cm
Panjang AB = AF + FB = 12 + 4 = 16cm
Luas = (DC+AB) * ED ÷ 2 L = (8+16) * 9 ÷ 2 L = 24 * 9 ÷ 2 L = 108cm² (C)
AC = 15cm
ED = FC = 9cm
Dit : L.Trap.ABCD = ...?
Jwb : cari panjang AF dg pitagoras.
AF² = AC² - FC²
= 225 - 81
= 144
AF = √144 = 12 cm.
Panjang DC = AF - AE
= 12 - 4 = 8cm
Panjang AB = AF + FB
= 12 + 4 = 16cm
Luas = (DC+AB) * ED ÷ 2
L = (8+16) * 9 ÷ 2
L = 24 * 9 ÷ 2
L = 108cm² (C)
Semoga membantu :)