Kk plis bantu jwb besok d kumpulkan pakek cara nya ya
Jawaban:
1.
L = (p × l) + (π × r²)
L = (20 × 15) + (3,14 × 10²)
L = 300 + 314
L = 614 cm²
2.
L = (p × l) – (1/2 × π × r²)
L = (30 × 14) – (1/2 × 22/7 × 7²)
L = 420 – (11 × 7)
L = 420 – 77
L = 343 cm²
3.
L = 1/2 × (a + b)t + (1/2 × π × r²)
L = 1/2 × (22 + 14)(24 – 14) + (1/2 × 22/7 × 14 × 14)
L = (1/2 × 36 × 10) + (11 × 2 × 14)
L = (18 × 10) + (22 × 14)
L = 180 + 308
L = 488 cm²
4.
L = (1/2 × a × t) – (1/2 × π × r²)
L = (1/2 × 35 × 35) – (1/2 × 22/7 × 17,5 × 17,5)
L = (1/2 × 1.225) – (11 × 306,25)
L = 612,5 – 306,25
L = 306,25 cm²