Page 64 - Inovasi Modul Matematika Bangun Datar Segi Empat_Lusi Malini_Neat

Keliling = 2 (27 cm)

Keliling = 54 cm

4. Diketahui : AE = 8 cm

BD = 30 cm

2
Luas = 420 cm

Ditanya : keliling ?

Jawab :

L = × d × d 2
1

L = × AC × BD

420 = × AC × 30

420 = 15 AC

AC = = 8

EC = AC – AE = 28 cm – 8 cm = 20 cm

AD = √8 5 = √64 5 = √ 89 = 7

DC = √ 5 = √ 5 4 = √6 5 = 5

Keliling = 2 (AD + DC)

Keliling = 2 (17 cm + 25 cm)

Keliling = 2 (42 cm)

Keliling = 84 cm

2
5. Diketahui : luas = 300 cm
AC = 24 cm

BC = 20 cm = AB

Ditanya : AD ?

Jawab :

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Bangun Datar Segiempat - VII