28. Perhatikan gambar ! Keliling bangun di samping adalah.... a. 130 cm b. 128 cm C. 124 cm d. 120 cm 29. Perhatikan gambar !
tolong bantu yaa
tolong bantu yaa
![](https://id-static.z-dn.net/files/dc0/4ccce65a11c6e0ad2023f2a91ce1f645.jpg)
Cari alas jajargenjang (a)
a² = 39² - 15²
a² = 1.521 - 225
a² = 1.296
a = √1.296
a = 36 cm
[tex] \: [/tex]
K = 15 cm + 15 cm + 39 cm + 15 cm 36 cm
K = 30 cm + 75 cm + 15 cm
K = 105 cm + 15 cm
K = 120 cm
- opsi D