Question

jawab dengan sungguh-sungguh, terimakasih​

Answer 1

Penjelasan dengan langkah-langkah:

5) p = 28 cm, l = 9 cm

Luas = p × l

Luas = 28 × 9

Luas = 28 × 10 – 28

Luas = 280 – 28

Luas = 252 cm²

6) Luas = 128 cm²

p = 16 cm

lebar = Luas

p

lebar = 128

16

lebar = 8 cm

7) d1 = 45 cm , d2 = 30 cm

s1 = 20 cm, s2 = 35 cm

Luas = d1 × d2

2

Luas = 45 × 30

2

Luas = 1.350

2

Luas = 675 cm²

Keliling = 2 × (s1 + s2)

Keliling = 2 × (20 + 35)

Keliling = 2 × 55

Keliling = 110 cm

8) a = 25 m, s = 7 m

Keliling = 2 × (a + s)

Keliling = 2 × (25 + 7)

Keliling = 2 × 32

Keliling = 64 meter

9) a = 110 m, t = 50 m

Luas = a × t

Luas = 110 × 50

Luas = 5.500 m²

Luas = 5.500 × 10.000 cm²

Luas = 55.000.000 cm²

Keliling = 2 × (a + t)

Keliling = 2 × (110 + 50)

Keliling = 2 × 160

Keliling = 320 meter

Keliling = 320 × 100

Keliling = 32.000 cm

10) AB = 87 cm, BC = 69 cm

Keliling = 2 × ( AB + BC )

Keliling = 2 × ( 87 + 69 )

Keliling = 2 × 156

Keliling = 312 cm

Answer 2

Jawaban:

5.) 252 cm²

6.) 8 cm

7.) Luas 630 cm² dan Keliling 110 cm

8.) 64 m

9.) Luas 550.000 cm² dan Keliling 320 cm

10.) 312 cm

Penjelasan dengan langkah-langkah:

5. Luas persegi panjang:

= panjang × lebar

= 28 cm × 9 cm

= 252 cm²

6. Lebar persegi panjang:

= luas ÷ panjang

= 128 cm² ÷ 16 cm

= 8 cm

7. Rumus layang-layang:

A. Luas layang-layang

= ½ × (diagonal × diagonal)

= ½ × (30 cm × 45 cm)

= 630 cm²

B. Keliling layang-layang

= (sisi pendek × 2) + (sisi panjang × 2)

= (20 cm × 2) + (35 cm × 2)

= 40 cm + 70 cm

= 110 cm

8. Keliling jajar genjang:

= (panjang × 2) + (lebar × 2)

= (25 m × 2) + (7 m × 2)

= 50 m + 14 m

= 64 m

9. Rumus jajar genjang:

Luas jajar genjang

= alas × tinggi

= 110 m × 50 m

= 5.500 m²

= 5.500 m² × 100

= 550.000 cm²

Keliling jajar genjang

= (panjang × 2) + (lebar × 2)

= (110 cm × 2) + (50 cm × 2)

= 220 cm + 100 cm

= 320 cm

10. Keliling jajar genjang:

= (sisi AB × 2) + (sisi CD × 2)

= (87 cm × 2) + (69 cm × 2)

= 174 cm + 138 cm

= 312 cm