Question

Qual a área de um triangulo que possui a altura de 150 cm e a base de 25% menor que a
altura?

Answer 1

$\Large\boxed{\begin{array}{l}\sf fator~de~reduc_{\!\!,}\tilde ao=1-\%_{em~decimal}\\\sf 25\%=0,25\\\sf fator~de~reduc_{\!\!,}\tilde ao=1-0,25=0,75\\\sf valor~reduzido=valor~original\cdot fator~de~reduc_{\!\!,}\tilde ao\\\sf valor~reduzido=150\cdot0,75\\\sf valor~reduzido=112,5~cm\end{array}}$

$\Large\boxed{\begin{array}{l}\tt dados\begin{cases}\sf b=112,5~cm\\\sf h=150~cm\\\sf A=?\end{cases}\\\underline{\rm soluc_{\!\!,}\tilde ao:}\\\sf A=\dfrac{b\cdot h}{2}\\\\\sf A=\dfrac{112,5\cdot\diagdown\!\!\!\!\!\!15\diagdown\!\!\!0}{\backslash\!\!\!2}\\\\\sf A=112,5\cdot75\\\sf\blue{ A=8437,5~cm^2}\green{\checkmark}\end{array}}$