luas bangun tersebut adalah...

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Mapel : Matematika
Tentang : Bangun Datar
Pembahasan :

Diketahui :

½ Lingkaran :
- d = 42 cm > r = 21 cm

Persegi Panjang :
- l = 42 cm
- p = 50 cm

Ditanya :
- L

LL= ½ x πr²
LL= ½ x 22/7 x 21 x 21
LL= ½ x 22 x 3 x 21
LL= 11 x 3 x 21
LL= 33 x 21
LL= 693 cm²

LP= p x l
LP= 50 x 42
LP= 2100 cm²

L Total : 2100 - 693 = 1407 cm²

Yg B jawabannya

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Heil Manstein!

Luas 1 = panjang×lebar= 50×42= 2.100 cm²
Luas 2=22/7 × 21 × 21 = 1.386 ÷ 2 = 693 cm2
2.100-693 = 1.407 cm² (B)