tolong dijawab berserta caranya

21. Luas persegi = s^2
s^2 = 36
s = √36
s = 6
keliling
4× s
4×6 = 24 cm

22. Luas segitiga
1/2×a×t
1/2×8×12
= 4×12 = 48 cm^2

Mapel Math
Bab Bangun Datar

Pembahasan :
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Panjang persegi
[tex] = \sqrt[2]{luas} = \sqrt[2]{36 } = 6 \: cm[/tex]
Keliling persegi
= 4 × s
= 4 × 6
= 24 cm
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Luas segitiga
= 1/2 × a × t
= 1/2 × 8 × 12
= 48 cm^2
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Good Luck ^^