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https://brainly.com.br/tarefa/38383058
[tex]\sf sen(20^\circ)=\dfrac{h}{4}\\\sf h=4sen(20^\circ)\\\sf h=4\cdot0,34\\\sf h=1,36~cm\\\sf A=\dfrac{b\cdot h}{2}\\\sf A=\dfrac{7\cdot1,36}{2}\\\sf A=7\cdot0,68\\\huge\boxed{\boxed{\boxed{\boxed{\sf A=4,76~cm^2}}}}\blue{\checkmark}[/tex]
