3 duilgheadasan agus fuasglaidhean mun cho-aontar Luas
1. Bidh càr a’ siubhal gu deas airson 100 m ann an 1 mionaid agus an uairsin a’ tionndadh chun an ear airson 120 m ann an 0.5 mionaidean. Obraich a-mach astar cuibheasach a’ chàir.
aithnichte:
Astar iomlan = 100 meatair + 120 meatair = 220 meatair
Ùine iomlan = 1 mionaid + 0.5 mionaidean = 1.5 mionaidean = 90 diogan
A dhìth: Astar cuibheasach
fuasgladh:
Foirmle astar
Astar cuibheasach = astar iomlan: ùine iomlan = 220 meatair: 90 diogan = 2.4 meatairean/diog
2. Bàta a’ siubhal ann an loidhne dhìreach airson astar 100 meatair an dèidh 10 diogan. Dè an astar cuibheasach a th’ aig a’ bhàta?
aithnichte:
Astar = 100 meatair
Ùine = 10 diogan
A dhìth : Astar cuibheasach
fuasgladh:
Foirmle astar
Astar cuibheasach = 100 meatair: 10 diogan = 10 meatairean/diog
3. Bidh mìrean a’ gluasad bho phuing O gu puing B ann an 4 diogan agus bho B gu A ann an 20 diogan. Obraich a-mach astar cuibheasach nam mìrean.
ainmeil:
Astar OB = 5 meatairean
Astar BA = 8 meatairean
Ùine OB = 4 diogan
Ùine BA = 20 diogan
A dhìth: Astar cuibheasach nam mìrean
fuasgladh:
Foirmle astar
Astar cuibheasach nam mìrean = astar iomlan : ùine iomlan = (5 + 8) : (4 + 20) = 13 : 24 = 0.54 meatairean/diog
