Question

@RedAsta100 bisa gak jawab ini​

Answer 1

Jawaban:

6. Keliling = 314 cm

7. luas arsiran = 262,5 cm²

Penjelasan:

6. keliling uang logam.

diameter uang logam:

= 10 dm......(ubah ke cm)

= 10 dm x 10

= 100 cm

keliling uang logam:

= π x diameter

= 3,14 x 100 cm

= 314 cm

----

7. luas daerah arsir.

Jari jari lingkaran:

= diameter ÷ 2 = 35 ÷ 2

= 17,5 cm

luas 2 bangun setengah lingkaran:

= 2 x ½ x π x r²

[tex] = 2 \times \frac{1}{2} \times \frac{22}{7} \times {(17.5)}^{2} [/tex]

[tex] = \frac{22}{7} \times 17.5 \times 17.5[/tex]

[tex] = 22 \times 17.5 \times (17.5 \div 7)[/tex]

[tex] = 385 \times 2.5[/tex]

= 962,5 cm²

----

luas persegi:

= sisi² = 35²

= 1.225 cm²

luas daerah arsir:

= luas persegi - luas lingkaran

= 1225 cm² - 962,5 cm²

= 262,5 cm²