a. mencari jari²
r = √(16 cm²) + √(12 cm²)
= √ 256 cm² + √ 144 cm²
= 400 cm² = 20 cm
Maka :
L 1/2 O = 1/2 πr²
= 1/2 . 3,14 . 20 cm . 20 cm
= 628 cm²
b. L. daerah di arsir
L . O = L (persegi panjang)
= πr² - (p x l)
= ( 3,14 x 15 cm x 15 cm ) - ( 30 cm - 16 cm)
= 706,5 cm² - 480 cm²
= 226,5 cm²
mohon maaf jika salah, jangan lupa kasih bintang 5 untuk ucapan TERIMAKASIH karena sudah dibantu.
Jawaban:
a. 157 cm²
b. 427,46 cm²
Penjelasan dengan langkah-langkah:
a.
BC² = AC² + AB²
BC² = 12² + 16²
BC² = 144 + 256
BC² = 400
BC = √400
BC = 20
r = BC/2
r = 20/2 = 10
L = 1/2(πr²)
L = 1/2(3,14 × 10²)
L = 1/2(3,14 × 100)
L = 1/2 × 314
L = 157 cm²
b.
a = 30 cm
b = 16 cm
c = diameter = d
c² = a² + b²
d² = 30² + 16²
d² = 900 + 256
d² = 1.156
d = √1.156
d = 34 cm
r = d/2
r = 34/2
r = 17 cm
Luas persegi panjang
Lpp = p × l
Lpp = 30 × 16
Lpp = 480 cm²
Luas daerah yang diarsir
L = πr² - Lpp
L = 3,14 × 17² - 480
L = 3,14 × 289 - 480
L = 907,46 - 480
L = 427,46 cm²
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a. mencari jari²
r = √(16 cm²) + √(12 cm²)
= √ 256 cm² + √ 144 cm²
= 400 cm² = 20 cm
Maka :
L 1/2 O = 1/2 πr²
= 1/2 . 3,14 . 20 cm . 20 cm
= 628 cm²
b. L. daerah di arsir
L . O = L (persegi panjang)
= πr² - (p x l)
= ( 3,14 x 15 cm x 15 cm ) - ( 30 cm - 16 cm)
= 706,5 cm² - 480 cm²
= 226,5 cm²
mohon maaf jika salah, jangan lupa kasih bintang 5 untuk ucapan TERIMAKASIH karena sudah dibantu.
Verified answer
Jawaban:
a. 157 cm²
b. 427,46 cm²
Penjelasan dengan langkah-langkah:
a.
BC² = AC² + AB²
BC² = 12² + 16²
BC² = 144 + 256
BC² = 400
BC = √400
BC = 20
r = BC/2
r = 20/2 = 10
L = 1/2(πr²)
L = 1/2(3,14 × 10²)
L = 1/2(3,14 × 100)
L = 1/2 × 314
L = 157 cm²
b.
a = 30 cm
b = 16 cm
c = diameter = d
c² = a² + b²
d² = 30² + 16²
d² = 900 + 256
d² = 1.156
d = √1.156
d = 34 cm
r = d/2
r = 34/2
r = 17 cm
Luas persegi panjang
Lpp = p × l
Lpp = 30 × 16
Lpp = 480 cm²
Luas daerah yang diarsir
L = πr² - Lpp
L = 3,14 × 17² - 480
L = 3,14 × 289 - 480
L = 907,46 - 480
L = 427,46 cm²