Jawaban:
21. Luas segitiga = 1/2 × alas × tinggi
= 1/2 × 23 × 20
= 230 cm^2
22. Luas set. lingkaran = 1/2 × π × r^2
= 1/2 × 3,14 × (40:2) ^2
= 1/2 × 3,14 × 400
= 628 cm^2
23. Luas segitiga = 1/2 × alas × tinggi
= 1/2 × 14 × 18
= 126 cm^2
Luas trapesium = (a+b)/2 × tinggi
= (18+30)/2 × 16
= 24 × 16
= 384 cm^2
Luas gabungan = 126 + 384
= 510 cm^2
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Jawaban:
21. Luas segitiga = 1/2 × alas × tinggi
= 1/2 × 23 × 20
= 230 cm^2
22. Luas set. lingkaran = 1/2 × π × r^2
= 1/2 × 3,14 × (40:2) ^2
= 1/2 × 3,14 × 400
= 628 cm^2
23. Luas segitiga = 1/2 × alas × tinggi
= 1/2 × 14 × 18
= 126 cm^2
Luas trapesium = (a+b)/2 × tinggi
= (18+30)/2 × 16
= 24 × 16
= 384 cm^2
Luas gabungan = 126 + 384
= 510 cm^2