tolong di.bantu ya kak

Please, let me answer your question :)
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Persegi Panjang :
- l = 8 cm
- p = 40 cm

2 Segitiga :
- t = 10 cm
- a = 8 cm

Ditanya = L?

LPP = p x l
LPP = 8 x 40
LPP = 320 cm²

2LS = ½ x a x t
2LS = ½ x 8 x 10
2LS = 4 x 10
2LS = 40 cm²

Karena ada 2 bangun, jadi : 40 x 2 = 80 cm²

L total = 320 + 80
L total = 400 cm²

Yg D jawabannya.

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Persegi Panjang :
- p = 28 cm
- l = 21 cm

½ Lingkaran :
- d = 21 cm

Ditanya = L arsir?

LPP = p x l
LPP = 28 x 21
LPP = 588 cm²

LL = ½ x ¼ x 22/7 x 21 x 21
LL = ½ x ¼ x 22 x 3 x 21
LL = ¼ x 11 x 3 x 21
LL = ¼ x 33 x 21
LL = 33 x 5,25
LL = 173,25 cm²

L arsir = 588 - 173,25 = 414,75 cm²

Yg D jawabannya.

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Heil Manstein!

——24——
Mapel : Matematika
Bab : Bangun Datar

Diketahui :
- Panjang (p) = 40 cm
- Lebar (l)/Alas (a) = 8 cm
- Tinggi (t) = 10 cm
- Luas Bangun (Lb) = Luas Persegi Panjang (Lp) + 2 × Luas Segitiga (2Ls)

Ditanya :
- Luas Bangun = ......?

Penyelesaian :
- Luas Persegi Panjang (Lp) :
Lp = p × l
Lp = 40 cm × 8 cm
Lp = 320 cm²

- 2 × Luas Segitiga (2Ls) :
2Ls = 2 × ½ × a × t
2Ls = 8 cm × 10 cm
2Ls = 80 cm²

- Luas Bangun :
Lb = Lp + 2Ls
Lb = 320 cm² + 80 cm²
Lb = 400 cm²

Jawaban : D. 400 cm²

——25——
Mapel : Matematika
Bab : Bangun Datar

Diketahui :
- Panjang (p) = 28 cm
- Lebar (l)/Diameter (d) = 21 cm
- Jari - Jari (r) = ½ × 21 cm = 10,5 cm
- Luas Bangun (Lb) = Luas Persegi Panjang (Lp) - Luas Setengah Lingkaran (½Lₗ)

Ditanya :
- Luas Bangun = ......?

Penyelesaian :
- Luas Persegi Panjang (Lp) :
Lp = p × l
Lp = 28 cm × 21 cm
Lp = 588 cm²

- Luas Setengah Lingkaran (½Lₗ) :
½Lₗ = ½ × π × r × r
½Lₗ = ½ × 22/7 × 10,5 cm × 10,5 cm
½Lₗ = 11/7 × 110,25 cm²
½Lₗ = 11 × 15,75 cm²
½Lₗ = 173,25 cm²

- Luas Bangun :
Lb = Lp - ½Lₗ
Lb = 588 cm² - 173,25 cm²
Lb = 414,75 cm²

Jawaban : D. 414,75 cm²

Maaf Kalau Salah