Eprilia
*Nomor 7 : Luas lahan = 20x 30 = 600 m² Luas taman bunga + taman rumput = 446 m² Luas kolam = 600 - 446 = 154 m²
L = πr² 154 = ²²/₇ x r² r² = 154 x ⁷/₂₂ r = √49 r = 7 m diameter = 7 x 2 = 14 m²
*Nomor 8 :
A. panjang CB = AB² + AC ² = 12² + 16² = 144 + 256 = √400 = 20 cm Luas yang di arsir : L = ¹/₂ x π x r² = ¹/₂ x ²²/₇ x 10² = ¹¹/₇ x 100 = 1100 ÷ 7 = 157,142 cm²
B. Luas Lingkaran = πr² = 3,14 × 15² = 3.14 × 225 = 706,5 cm² Luas persegi panjang = P × L = 30 × 16 = 480 cm²
Luas lahan = 20x 30 = 600 m²
Luas taman bunga + taman rumput = 446 m²
Luas kolam = 600 - 446 = 154 m²
L = πr²
154 = ²²/₇ x r²
r² = 154 x ⁷/₂₂
r = √49
r = 7 m
diameter = 7 x 2 = 14 m²
*Nomor 8 :
A. panjang CB = AB² + AC ²
= 12² + 16²
= 144 + 256
= √400 = 20 cm
Luas yang di arsir :
L = ¹/₂ x π x r²
= ¹/₂ x ²²/₇ x 10²
= ¹¹/₇ x 100
= 1100 ÷ 7 = 157,142 cm²
B. Luas Lingkaran = πr²
= 3,14 × 15²
= 3.14 × 225
= 706,5 cm²
Luas persegi panjang
= P × L
= 30 × 16 = 480 cm²
Luas yang di arsir = 706,5 - 480 = 226,5 cm²