1. Ρ = 2(20 + 8) - 2πR = 56 - 25,12 = 30,88 см
S = 20 х 8 - πR² = 160 - 3,14 х 4² = 160 - 50,24 = 109,76 см²
2. P = 4 х 2R - 2πR = 8 х 16 - 6,28 х 16 = 128 - 100,48 = 27,52 см
S = (2R)² - πR² = 32² - 3,14 х 16² = 1024 - 803,84 = 220,16 см²
3. P = 2πR/2 + 2(b +2R) + (c + (a - b)) = (6,28 х 4) : 2 + 2(5 + 8) + (10 +6) =
= 12,56 + 26 + 16 = 54,56 см
S = πR²/2 + 2Rb + 1/2((a -b) х 2R) = (3,14 х 16) : 2 + 8 х 5 + 1/2(6 х 8) =
= 25,12 + 40 + 24 = 89,12 см²
4. P = πR/2 + 2πR/4 = (3,14 х 20) : 2 + (6,28 х 20) : 4 = 31,4 + 31,4 = 62,8 см
S = πr²/2 + πR²/4 = (3,14 х 10²) : 2 + (3,14 х 20²) : 4 = 157 + 314 = 471 см²