tolong dong no 12-15 pakai cara ya!

12. Diketahui: Keliling = 60 cm
Ditanya: Diagonal
Jawab: Diagonal = s√2
s = k/4 = 60/4 = 15
= 15√2
= 21.21 cm

12. 2(diagonal persegi)=60
diagonal = 30cm

13. 21(21)-18(18) = 441-324 = (akar)117

14. DF(kuadrat)=144+81 = 225
DF = akar 225 = 15 cm

semoga membantu:)