Farsaingeachd cheithir-cheàrnaich - trapesium
Farsaingeachd trapesium
Frasaingeachd triantain 1 \(A = \frac{1}{2}bh\)
\(= \frac{1}{2} \times 2 \times 7\)
\(= \frac{1}{2} \times 14\)
\(= 7\,c{m^2}\)
Farsaingeachd ceart-chearnaich 2 \(A = l \times b\)
\(= 5 \times 7\)
\(= 35\,{cm^2}\)
Frasaingeachd triantain 3 \(A = \frac{1}{2}bh\)
\(= \frac{1}{2} \times 9 \times 7\)
\(= \frac{1}{2} \times 63\)
\(= 31.5\,c{m^2}\)
\(Farsaingeachd\,iomlan = 7 + 35 + 31.5 = 73.5\,c{m^2}\)
