1)
8 < 2r, więc rysunek jest jaki jest
h₁² + (8/2)² = r²
h₁² = r² - (8/2)² = 9
h₁ = 3
h₂ = r-h₁ = 5-3 = 2
tw. pitagorasa
h₂² + (8/2)² = x²
x² = 4 + 16 = 20
x = 4√5
2)
h = 2*2= 4
a = 4*2 = 8
P = ah = 8*4 = 32
sin30° = h/c
c * sin30° = h
c = h/sin30° = 2h = 8
Ob = 2a + 2c = 2*8 + 2*8 = 32
