Question

Please di jawab...........

Answer 1

1) r = 15 cm
luas = πr²
= 3,14 x 15 x 15
= 706,5 cm²

2) r = 10,5 cm
luas = luas persegi panjang + luas 1/2 lingkaran
= (p x l) + (1/2 x πr²) 
= (25 x 21) + (1/2 x 22/7 x 10,5 x 10,5)
= 525 + 173,25
= 698,25 cm²

3) luas yang diarsir = luas pergi panjang - luas segitiga
= (p x l) - (1/2 x a x t)
= (22 x 28) - (1/2 x 22 x 28)
= 616 - 308
= 308 cm²

4) volume prisma = luas alas x tinggi
= 1/2 x a x t-segitiga x t-prisma
= 1/2 x 18 x 15 x 30
= 4050 cm³

Answer 2

1. 3,14 x 15 x 15 = 706,5 cm
2. 25 x 21 = 525 + 3,14 x 10,5 x 10,5 = 698,092 cm
3. 22 x 28 : 2 = 308
22 x 28 = 616
616 - 308 = 308 cm
4. 15 x 18 x 30 : 2 = 4050 cm