Area:-
[tex]\\ \rm\hookrightarrow \dfrac{1}{2}BH[/tex]
[tex]\\ \rm\hookrightarrow \dfrac{1}{2}(4)(7)[/tex]
[tex]\\ \rm\hookrightarrow 2(7)[/tex]
[tex]\\ \rm\hookrightarrow 14cm^2[/tex]
[tex] \tt \frac{1}{ \cancel2} \times \cancel 4 \times 7[/tex]
[tex] \tt \: 2 \times 7[/tex]
[tex] \tt \: 14 {cm}^{2} [/tex]