Here's the solution,
Area of rectangle :
=》
[tex]l \times b[/tex]
[tex]23 \times 12[/tex]
[tex]276 \: \: cm {}^{2} [/tex]
Area of trapezoid :
note : h = 18 - 12 = 6 cm
[tex] \dfrac{1}{2} \times (a + b) \times h[/tex]
[tex] \dfrac{1}{2} \times (23 + 15) \times 6 [/tex]
[tex]38 \times 3[/tex]
[tex]114 \: \: cm {}^{2} [/tex]
Area of whole figure (V) = sum of their Areas,
[tex]276 + 114[/tex]
[tex]390 \: \: cm {}^{2} [/tex]
