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No 1.

Luas bagian yg diarsir
= Luas persegi - luas lingkaran
= (sisi × sisi) - (22/7 × r × r)
= (14 × 14) - (22/7 × 7 × 7)
= 196 - (22 × 7)
= 196 - 154
= 42 cm²

No 2.

Luas persegi panjang
= panjang × lebar
= 16 × 8
= 128 cm²

Luas segitiga
= 1/2 × alas × tinggi
= 1/2 × 16 × 7
= 8 × 7
= 56 cm²

Luas gabungan
= luas persegi panjang + luas segitiga
= 128 cm² + 56 cm²
= 184 cm²

No 3.

Luas 1/4 lingkaran
= 1/4 × 22/7 × r × r
= 1/4 × 22/7 × 14 × 14
= 1/4 × 22 × 2 × 14
= 1/4 × 44 × 14
= 11 × 14
= 154 cm²

No 4.

Volume bangun
= Luas alas × tinggi
= (1/2 × alas × tinggi) × tinggi
= (1/2 × 8 × 5) × 7
= (4 × 5) × 7
= 20 × 7
= 140 cm³

No 5.

Volume tabung 1
= 3,14 × r × r × tinggi
= 3,14 × 10 × 10 × 15
= 31,4 × 10 × 15
= 314 × 15
= 4710 cm³

Volume tabung 2
= 3,14 × r × r × tinggi
= 3,14 × 5 × 5 × 7
= 15,7 × 5 × 7
= 78,5 × 7
= 549,5 cm³

Volume gabungan
= 4710 cm³ + 549,5 cm³
= 5259 cm³

Semoga membantu ^-^